2025 Cadillac CT4 Engine Parts

This table covers the camshafts that open the valves. Read more

7 Camshaft parts for the 2025 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 12745084, GM GENUINE 12698637 and GM GENUINE 12739839, plus the other parts above.

This table covers the seals at each camshaft end. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12574477.

This table covers the Circular / Semi-Circular plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 11546667.

This table covers the connecting rods between each piston and the crankshaft. Read more

2 Connecting Rod parts for the 2025 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 12641607 and GM GENUINE 12652977.

This table covers the bearings in the connecting-rod big ends. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

2 Connecting Rod Bearing parts for the 2025 Cadillac CT4 come from GM GENUINE.

This group includes GM GENUINE 12643667 and GM GENUINE 19301183.

This table covers the Connecting Rod bolts. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

This group includes GM GENUINE 11519680 and GM GENUINE 11547385.

This table covers the crankshafts that turn piston motion into rotation. Read more

2 Crankshaft parts for the 2025 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 12653000 and GM GENUINE 12683977.

This table covers the main bearings that support the crankshaft in the block. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

Listed part numbers: GM GENUINE 12643668 and GM GENUINE 12643670.

This table covers the Crankshaft Main Bearing Cap bolts. Read more

5 Crankshaft Main Bearing Cap Bolt parts for the 2025 Cadillac CT4 come from GM GENUINE. The "Popular" part is GM GENUINE 12560272.

Listed part numbers: GM GENUINE 12560272, GM GENUINE 11588713 and GM GENUINE 11518861, plus the other parts above.

This table covers the front and rear seals that keep oil in at the crankshaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

GM GENUINE supplies the 3 Crankshaft Seal parts for the 2025 Cadillac CT4.

This group includes GM GENUINE 12693989, GM GENUINE 12608750 and GM GENUINE 12637710.

This table covers the Crankshaft Seal covers. Read more

This group shows a single part: GM GENUINE 12741554.

This table covers the cylinder heads that close the top of the block. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

This group includes GM GENUINE 12733805 and GM GENUINE 12709312.

This table covers the Cylinder Head Alignment Dowel pins. Read more

This group shows a single part: GM GENUINE 12570326.

This table covers the bolts that clamp the cylinder head to the block. Read more

4 Cylinder Head Bolt parts for the 2025 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 11603109, GM GENUINE 11547740 and GM GENUINE 19352499, plus the other parts above.

This table covers the head gaskets that seal the block to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Cylinder Head Gasket parts for the 2025 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 12691233 and GM GENUINE 12658085.

This table covers multi-piece gasket sets for a cylinder-head job. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

This group shows a single part: GM GENUINE 12670740.

This table covers the Cylinder Head plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

Part numbers include GM GENUINE 11546667 and GM GENUINE 09427693.

This table covers the Engine Block drain plugs. Read more

This group shows a single part: GM GENUINE 11602951.

This table covers the block heaters that warm the coolant or oil in cold weather. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12586687.

This table covers the Engine Cover grommets. Read more

GM GENUINE supplies the 4 Engine Cover Grommet parts for the 2025 Cadillac CT4.

Part numbers include GM GENUINE 12594875, GM GENUINE 12737359 and GM GENUINE 12559120, among others listed above.

This table covers the exhaust valves that let combustion gas out of the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12674513.

This table covers the Expansion plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

This group shows a single part: GM GENUINE 11569584.

This table covers the followers that drive a mechanical fuel pump off the camshaft. Read more

This group shows a single part: GM GENUINE 12718357.

This table covers the crankshaft pulleys / harmonic balancers at the front of the engine. Read more

2 Harmonic Balancer parts for the 2025 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 12705813 and GM GENUINE 12603180.

This table covers the Harmonic Balancer bolts. Read more

2 Harmonic Balancer Bolt parts are listed for the 2025 Cadillac CT4, from DORMAN and GM GENUINE.

This group includes DORMAN 595005 and GM GENUINE 11549124.

This table covers the Intake insulators. Read more

This group shows a single part: GM GENUINE 12559120.

This table covers the Intake manifolds. Typical signs include an exhaust tick, a vacuum leak, or a gasket that has burned through. Replace the gaskets and hardware; a warped flange will leak with a new gasket alone. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

Listed part numbers: GM GENUINE 12698870 and GM GENUINE 12706155.

This table covers the Intake Manifold bolts. Read more

This group shows a single part: GM GENUINE 11548171.

This table covers the gaskets between the intake manifold and the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Intake Manifold Gasket parts for the 2025 Cadillac CT4 come from GM GENUINE.

This group includes GM GENUINE 12663540 and GM GENUINE 12657374.

This table covers the gaskets that seal the Intake Plenum. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12670741.

This table covers the intake valves that let air (and fuel, on port-injected engines) into the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

2 Intake Valve parts are listed for the 2025 Cadillac CT4, from GM GENUINE and MELLING.

Listed part numbers: GM GENUINE 12610931 and MELLING V5844.

This table covers the mounts that hold the engine to the chassis. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes. Read more

GM GENUINE supplies the 3 Motor Mount parts for the 2025 Cadillac CT4.

Listed part numbers: GM GENUINE 85156938, GM GENUINE 85156937 and GM GENUINE 85156939.

This table covers the Motor Mount bolts. Read more

This group shows a single part: GM GENUINE 11549341.

This table covers the brackets that mount the Motor Mount. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 84146175.

This table covers the Motor Mount Bracket bolts. Read more

This group shows a single part: GM GENUINE 11588740.

This table covers the engine oils listed by grade and specification for this engine. Typical signs include a low-oil lamp, knocking after a long interval, or oil that has gone thin and black well before the next service. Match the viscosity and spec in the notes (and on the filler cap). The tables group grades — they are not interchangeable. Read more

19 Oil parts are listed for the 2025 Cadillac CT4, from MOBIL, LIQUI MOLY, VALVOLINE and 3 other brands. ACDELCO 109324 carries the "Popular" badge.

In the Full Synthetic grade, LIQUI MOLY, VALVOLINE, MOBIL and 3 other brands supply 17 parts: full-synthetic oils. A representative part number is ACDELCO 109324.

The High Mileage (>75,000 Miles) section lists 2 options from MOBIL — oils grouped for high-mileage engines. MOBIL 123842 is listed in this group.

This table covers the heat exchangers that cool engine oil. Typical signs include oil at the cooler fittings, or coolant that looks like a milkshake. Pressure-test both circuits after a cooler swap — a leak here mixes oil and coolant. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12699975.

This table covers the gaskets that seal the Oil Cooler. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Oil Cooler Gasket parts for the 2025 Cadillac CT4 come from 2 brands — ACDELCO and DORMAN.

This group includes ACDELCO 12670864 and DORMAN 66219.

This table covers the seals at the Oil Cooler. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

5 Oil Cooler Seal parts for the 2025 Cadillac CT4 come from 3 brands — ACDELCO, GM GENUINE and ELRING.

This group includes ACDELCO 12698624, ACDELCO 12670864 and ELRING B17840 and the remaining parts above.

This table covers the seals at the Oil Dipstick / Tube. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

2 Oil Dipstick / Tube Seal parts for the 2025 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 24504031 and GM GENUINE 12670252.

This table covers the drain plugs in the oil pan. Read more

7 Oil Drain Plug parts are listed for the 2025 Cadillac CT4, from DORMAN and GM GENUINE.

Listed part numbers: DORMAN 090854CD, DORMAN 090854 and DORMAN 090034, plus the other parts above.

This table covers the crush washers and gaskets under the oil drain plug. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Oil Drain Plug Gasket parts for the 2025 Cadillac CT4 come from GM GENUINE.

This group includes GM GENUINE 12667457 and GM GENUINE 12616850.

This table covers the Oil Drain Plug inserts. Read more

This group shows a single part: GM GENUINE 11503302.

This table covers the caps on the oil filler neck. Read more

ACDELCO supplies both parts for the 2025 Cadillac CT4.

This group includes ACDELCO FC268 and ACDELCO FC279.

This table covers the gaskets that seal the Oil Filler Cap. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

This group shows a single part: GM GENUINE 24100002.

This table covers the oil filters that screw onto this engine's filter mount. Typical signs include low oil pressure after a service, or a filter that will not spin off because the old gasket stayed on the block. Lube the new gasket and tighten to the spec on the box; a double-gasket install dumps the sump on the first drive. Read more

20 Oil Filter parts are listed for the 2025 Cadillac CT4, from WIX, ACDELCO, VARIOUS MFR and 5 other brands. WIX WL10255XP carries the "Popular" badge.

In the Economy grade, FVP, PRO-TEC, VARIOUS MFR and 1 other brand supply 7 parts: the catalog's value-priced group. A representative part number is FRAM FE10575.

In the High Performance / Heavy Duty grade, WIX and MOBIL supply 4 parts: grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. A representative part number is WIX WL10255XP.

The Standard Replacement section lists 9 options from ACDELCO, WIX, HASTINGS / BALDWIN and 1 other brand — built to original-equipment specification. ACDELCO PF66 is listed in this group.

This table covers the Oil Filter adapters. Read more

2 Oil Filter Adapter parts for the 2025 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 12600225 and GM GENUINE 12732883.

This table covers the Oil Filter Adapter Gasket O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

This group shows a single part: GM GENUINE 12675796.

This table covers the gaskets that seal the Oil Filter. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

This group shows a single part: GM GENUINE 12687466.

This table covers the Oil Galley plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

Part numbers include GM GENUINE 11570754 and GM GENUINE 12667039.

This table covers the Oil Level sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12696433.

This table covers the Oil Level Sensor Gasket O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

Part numbers include GM GENUINE 12626252 and GM GENUINE 12638820.

This table covers the Oil nozzles. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12716498.

This table covers the oil pans that hold the engine's oil sump. Read more

5 Oil Pan parts for the 2025 Cadillac CT4 come from 2 brands — GM GENUINE and DORMAN.

Part numbers include DORMAN 266010, GM GENUINE 12732388 and GM GENUINE 12713652, among others listed above.

This table covers the Oil Pan bolts. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

Part numbers include GM GENUINE 11588725 and GM GENUINE 11588694.

This table covers the gaskets between the oil pan and the block. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12663435.

This table covers the Oil pumps. Typical signs include noise from the pump, no pressure, or fluid that never arrives at the outlet. Prime or fill the pump as the notes require. A dry start is a common way to kill a new unit. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

Part numbers include GM GENUINE 12740051 and GM GENUINE 12640448.

This table covers the Oil Pump bolts. Read more

This group shows a single part: GM GENUINE 11588729.

This table covers the Oil Pump Control Valve solenoids. Typical signs include a harsh or missing shift, or a code for this solenoid circuit. Check resistance and the connector before dropping the pan for a solenoid. Read more

This group shows a single part: GM GENUINE 12740050.

This table covers the seals at the Oil Pump Control Valve / Solenoid. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

Part numbers include GM GENUINE 12626252 and GM GENUINE 12638265.

This table covers the O-rings that seal the oil-pump pickup tube. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12691257.

This table covers the windage trays that keep crank windage out of the oil sump. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12657086.

This table covers the Oil Temperature senders. Read more

This group shows a single part: GM GENUINE 55494665.

This table covers the pistons that travel in each cylinder. Typical signs include knock, blow-by, or a cylinder that will not hold compression. Piston work is a short-block job. Match bore, pin and ring pack in the notes — not the photo. Read more

6 Piston parts for the 2025 Cadillac CT4 come from GM GENUINE. The "Popular" part is GM GENUINE 12641603.

Listed part numbers: GM GENUINE 12641603, GM GENUINE 12744924 and GM GENUINE 12686350, plus the other parts above.

This table covers the Piston Pin retainers. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

This group includes GM GENUINE 01647383 and GM GENUINE 12566186.

This table covers the rings that seal each piston to the cylinder wall. Read more

2 Piston Ring parts for the 2025 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 12693554 and GM GENUINE 12654442.

This table covers the rocker arms that transfer cam motion to the valves. Read more

2 Rocker Arm parts are listed for the 2025 Cadillac CT4, from GM GENUINE and SKP.

Listed part numbers: GM GENUINE 24100294 and SKP SKMR1323.

This table covers the Rocker Arm nuts. Read more

This group shows a single part: GM GENUINE 11546449.

This table covers the gaskets that seal the Supercharger. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12608993.

This table covers the Timing Cam sprockets. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

This group includes GM GENUINE 12612839 and GM GENUINE 12612838.

This table covers the timing chains that keep the cams in time with the crank. Read more

5 Timing Chain parts for the 2025 Cadillac CT4 come from 2 brands — GM GENUINE and MELLING.

This group includes GM GENUINE 12671642, GM GENUINE 12637744 and GM GENUINE 12637743 and the remaining parts above.

This table covers kits that group a timing chain with the related tensioners and guides. Read more

2 Timing Chain & Component Kit parts are listed for the 2025 Cadillac CT4, from GM GENUINE and MELLING.

Part numbers include GM GENUINE 12700438 and MELLING 3753SX.

This table covers the guides and dampers that keep the timing chain on its path. Read more

14 Timing Chain Guide / Damper parts for the 2025 Cadillac CT4 come from 2 brands — GM GENUINE and MELLING. The "Popular" part is GM GENUINE 12623514.

This table covers the tensioners that keep the timing chain taut. Typical signs include belt flutter, a chirp that returns after a new belt, or an arm that no longer damps. Replace the tensioner with the belt at higher mileage. Read more

9 Timing Chain Tensioner parts are listed for the 2025 Cadillac CT4, from GM GENUINE and MELLING. MELLING BT5536 carries the "Popular" badge.

Listed part numbers: MELLING BT5536, MELLING BT5537 and GM GENUINE 12736204, plus the other parts above.

This table covers the seals at the Timing Chain Tensioner Gasket. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

3 Timing Chain Tensioner Gasket / Seal parts for the 2025 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 12678978, GM GENUINE 12589479 and GM GENUINE 12589477.

This table covers the Timing covers. Read more

This group shows a single part: GM GENUINE 12732627.

This table covers the Timing Cover bolts. Read more

GM GENUINE supplies the 5 Timing Cover Bolt parts for the 2025 Cadillac CT4.

Listed part numbers: GM GENUINE 11548002, GM GENUINE 11547061 and GM GENUINE 11588730, plus the other parts above.

This table covers the gaskets that seal the Timing Cover. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12589478.

This table covers the seals at the Timing Cover. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 12741846.

This table covers the crankshaft sprockets that drive the timing chain or belt. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT4.

This group includes GM GENUINE 12725693 and GM GENUINE 12654245.