2026 Cadillac CT4 Engine Parts

This table covers the Balance Shaft covers. Read more

One part is listed for the 2026 Cadillac CT4 — GM GENUINE 55510644.

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

GM GENUINE supplies the 8 Camshaft parts for the 2026 Cadillac CT4.

Listed part numbers: GM GENUINE 12703359, GM GENUINE 55511463 and GM GENUINE 12698637, 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

This group shows a single part: 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

2 Circular / Semi-Circular Plug parts for the 2026 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 11562126 and GM GENUINE 11546667.

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

GM GENUINE supplies both parts for the 2026 Cadillac CT4.

Listed part numbers: 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

GM GENUINE supplies both parts for the 2026 Cadillac CT4.

Part numbers include GM GENUINE 12643667 and GM GENUINE 19301183.

This table covers the Connecting Rod bolts. Read more

This group shows a single part: GM GENUINE 11519680.

This table covers the Crankcase pressure sensors. Typical signs include a check-engine light for MAP or fuel-rail pressure, or a limp mode under load. A vacuum leak or a clogged reference line will fake a bad pressure sensor. Read more

This group shows a single part: GM GENUINE 12815887.

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

One part is listed for the 2026 Cadillac CT4 — 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

2 Crankshaft Main Bearing parts for the 2026 Cadillac CT4 come from GM GENUINE.

This group includes GM GENUINE 12643668 and GM GENUINE 12643670.

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

GM GENUINE supplies the 5 Crankshaft Main Bearing Cap Bolt parts for the 2026 Cadillac CT4. GM GENUINE 12560272 carries the "Popular" badge.

This group includes GM GENUINE 12560272, GM GENUINE 11588713 and GM GENUINE 11518861 and the remaining 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

3 Crankshaft Seal parts for the 2026 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 12693989, GM GENUINE 12608750 and GM GENUINE 12637710.

This table covers the Crankshaft Seal covers. Read more

GM GENUINE supplies both parts for the 2026 Cadillac CT4.

This group includes GM GENUINE 55486914 and GM GENUINE 12741554.

This table covers the gaskets that seal the Crankshaft Seal. 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 2026 Cadillac CT4 — GM GENUINE 55502355.

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

3 Cylinder Head parts for the 2026 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 12729490, GM GENUINE 12733805 and GM GENUINE 12709312.

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

One part is listed for the 2026 Cadillac CT4 — GM GENUINE 12570326.

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

GM GENUINE supplies the 5 Cylinder Head Bolt parts for the 2026 Cadillac CT4.

Listed part numbers: GM GENUINE 11603109, GM GENUINE 11548293 and GM GENUINE 11547740, 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

GM GENUINE supplies the 3 Cylinder Head Gasket parts for the 2026 Cadillac CT4.

Listed part numbers: GM GENUINE 55486594, 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

One part is listed for the 2026 Cadillac CT4 — 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

2 Cylinder Head Plug parts for the 2026 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 11546667 and GM GENUINE 09427693.

This table covers the Engine Block drain plugs. Read more

One part is listed for the 2026 Cadillac CT4 — GM GENUINE 11602951.

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

This group shows a single part: GM GENUINE 12586687.

This table covers the Engine Cover grommets. Read more

4 Engine Cover Grommet parts for the 2026 Cadillac CT4 come from GM GENUINE. 1 part fits every engine; the other 3 are engine-specific.

Part numbers include GM GENUINE 12559120, GM GENUINE 12661056 and GM GENUINE 12594875, among others listed above.

This table covers the Engine Cover retainers and clips. Read more

This group shows a single part: GM GENUINE 11518792.

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

This group shows a single part: 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

One part is listed for the 2026 Cadillac CT4 — GM GENUINE 11569584.

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

GM GENUINE supplies both parts for the 2026 Cadillac CT4.

Part numbers include GM GENUINE 12748968 and GM GENUINE 12718357.

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

GM GENUINE supplies the 3 Harmonic Balancer parts for the 2026 Cadillac CT4.

This group includes GM GENUINE 55487414, GM GENUINE 12705813 and GM GENUINE 12603180.

This table covers the Harmonic Balancer bolts. Read more

2 Harmonic Balancer Bolt parts for the 2026 Cadillac CT4 come from 2 brands — DORMAN and GM GENUINE.

Listed part numbers: DORMAN 595005 and GM GENUINE 11549124.

This table covers the Intake insulators. Read more

One part is listed for the 2026 Cadillac CT4 — 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

3 Intake Manifold parts for the 2026 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 55506352, GM GENUINE 12698870 and GM GENUINE 12706155.

This table covers the Intake Manifold bolts. Read more

One part is listed for the 2026 Cadillac CT4 — 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

GM GENUINE supplies the 3 Intake Manifold Gasket parts for the 2026 Cadillac CT4.

Part numbers include GM GENUINE 55488180, 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

This group shows a single part: 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

This group shows a single part: GM GENUINE 12610931.

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

4 Motor Mount parts for the 2026 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 85156938, GM GENUINE 85156936 and GM GENUINE 85156937, among others listed above.

This table covers the Motor Mount bolts. Read more

One part is listed for the 2026 Cadillac CT4 — 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

This group shows a single part: GM GENUINE 84146175.

This table covers the Motor Mount Bracket bolts. Read more

One part is listed for the 2026 Cadillac CT4 — 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

34 Oil parts for the 2026 Cadillac CT4 come from 6 brands — MOBIL, LIQUI MOLY, VALVOLINE and 3 other brands. The "Popular" part is ACDELCO 109302. Grades run from Full Synthetic through High Mileage (>75,000 Miles); Full Synthetic is the most populated section, led by LIQUI MOLY, VALVOLINE, MOBIL and 3 other brands.

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

This group shows a single part: GM GENUINE 55486915.

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 are listed for the 2026 Cadillac CT4, from ACDELCO and DORMAN. 1 part fits every engine; the other 1 is engine-specific.

Listed part numbers: ACDELCO 12670864 and DORMAN 66219.

This table covers the Oil Cooler lines. Typical signs include a wet fitting, a rusted pipe, or a pressure loss in this circuit. Flare or thread the new line the way the notes specify; a kinked replacement will fail early. Read more

5 Oil Cooler Line parts for the 2026 Cadillac CT4 come from GM GENUINE. The "Popular" part is GM GENUINE 11570871.

Part numbers include GM GENUINE 11570871, GM GENUINE 11548826 and GM GENUINE 90572594, among others listed above.

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 are listed for the 2026 Cadillac CT4, from ACDELCO and GM GENUINE.

Listed part numbers: ACDELCO 55488933, ACDELCO 12698624 and ACDELCO 12670864, plus the other 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

GM GENUINE supplies both parts for the 2026 Cadillac CT4. 1 part fits every engine; the other 1 is engine-specific.

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

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

3 Oil Drain Plug parts for the 2026 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 12713651, GM GENUINE 11602884 and GM GENUINE 11562588.

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

GM GENUINE supplies both parts for the 2026 Cadillac CT4.

This group includes GM GENUINE 12667457 and GM GENUINE 12616850.

This table covers the Oil Drain Plug inserts. Read more

One part is listed for the 2026 Cadillac CT4 — GM GENUINE 11503302.

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

3 Oil Filler Cap parts for the 2026 Cadillac CT4 come from ACDELCO.

Listed part numbers: ACDELCO FC272, 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

One part is listed for the 2026 Cadillac CT4 — 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 for the 2026 Cadillac CT4 come from 8 brands — WIX, ACDELCO, VARIOUS MFR and 5 other brands. The "Popular" part is WIX WL10255XP.

The Economy section lists 7 options from FVP, PRO-TEC, VARIOUS MFR and 1 other brand — the catalog's value-priced group. FRAM FE10575 is listed in this group.

The High Performance / Heavy Duty section lists 4 options from WIX and MOBIL — grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. WIX WL10255XP is listed in this group.

In the Standard Replacement grade, ACDELCO, WIX, HASTINGS / BALDWIN and 1 other brand supply 9 parts: built to original-equipment specification. A representative part number is ACDELCO PF66.

This table covers the Oil Filter adapters. Read more

GM GENUINE supplies both parts for the 2026 Cadillac CT4.

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

One part is listed for the 2026 Cadillac CT4 — 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

One part is listed for the 2026 Cadillac CT4 — 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

2 Oil Galley Plug parts for the 2026 Cadillac CT4 come from GM GENUINE.

This group includes 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

This group shows a single part: 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

2 Oil Level Sensor Gasket / O-Ring parts for the 2026 Cadillac CT4 come from GM GENUINE.

This group includes GM GENUINE 12626252 and GM GENUINE 12638820.

This table covers the Oil nozzles. Read more

This group shows a single part: GM GENUINE 12716498.

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

GM GENUINE supplies the 5 Oil Pan parts for the 2026 Cadillac CT4.

Part numbers include GM GENUINE 12717172, GM GENUINE 12732388 and GM GENUINE 12713652, among others listed above.

This table covers the Oil Pan bolts. Read more

2 Oil Pan Bolt parts for the 2026 Cadillac CT4 come from GM GENUINE.

Listed part numbers: 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

This group shows a single part: GM GENUINE 12663435.

This table covers the Oil Pressure Relief Valve 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 11570754.

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

3 Oil Pump parts for the 2026 Cadillac CT4 come from GM GENUINE.

This group includes GM GENUINE 12741330, GM GENUINE 12740051 and GM GENUINE 12640448.

This table covers the Oil Pump bolts. Read more

GM GENUINE supplies both parts for the 2026 Cadillac CT4.

This group includes GM GENUINE 11548002 and 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

One part is listed for the 2026 Cadillac CT4 — 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

2 Oil Pump Control Valve / Solenoid Seal parts for the 2026 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 12626252 and GM GENUINE 12638265.

This table covers the gaskets that seal the Oil Pump. 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 2026 Cadillac CT4 — GM GENUINE 55500219.

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

This group shows a single part: GM GENUINE 12691257.

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

This group shows a single part: GM GENUINE 12657086.

This table covers the Oil Temperature senders. Read more

One part is listed for the 2026 Cadillac CT4 — 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

GM GENUINE supplies the 3 Piston parts for the 2026 Cadillac CT4.

This group includes GM GENUINE 12744924, GM GENUINE 12686350 and GM GENUINE 12686351.

This table covers the Piston Pin retainers. Read more

2 Piston Pin Retainer parts for the 2026 Cadillac CT4 come from GM GENUINE.

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

GM GENUINE supplies the 3 Piston Ring parts for the 2026 Cadillac CT4.

Listed part numbers: GM GENUINE 12720003, GM GENUINE 12693554 and GM GENUINE 12654442.

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

4 Rocker Arm parts for the 2026 Cadillac CT4 come from 2 brands — GM GENUINE and SKP.

This group includes GM GENUINE 12739173, GM GENUINE 12731971 and GM GENUINE 24100294 and the remaining parts above.

This table covers the Rocker Arm nuts. Read more

One part is listed for the 2026 Cadillac CT4 — 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

This group shows a single part: GM GENUINE 12608993.

This table covers the Timing Cam sprockets. Read more

2 Timing Cam Sprocket parts for the 2026 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 12612839 and GM GENUINE 12612838.

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

GM GENUINE supplies the 4 Timing Chain parts for the 2026 Cadillac CT4.

Listed part numbers: GM GENUINE 55514729, GM GENUINE 12671642 and GM GENUINE 12637744, plus the other parts above.

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

This group shows a single part: GM GENUINE 12700438.