2025 Toyota Highlander Engine Parts

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

This group shows a single part: TOPLINE RBTO59.

This table covers lower / conversion gasket sets for oil-pan and related joints. 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: TOPLINE CBSTO59.

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

TOPLINE supplies both parts for the 2025 Toyota Highlander.

Listed part numbers: TOPLINE TWTO59 and TOPLINE MBTO59.

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

This group shows a single part: TOPLINE HBTO59.

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

This group shows a single part: MAHLE / CLEVITE 55502.

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: TOPLINE HSTO59.

This table covers the Engine covers. Read more

This group shows a single part: TECHPRO TO1228313.

This table covers full gasket kits covering the joints opened in an engine rebuild. 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: TOPLINE CGSTO59.

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 Toyota Highlander — TOPLINE EVTO59.

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 Toyota Highlander come from 2 brands — BECK/ARNLEY and MAHLE / CLEVITE.

This group includes BECK/ARNLEY 0376251 and MAHLE / CLEVITE MS20603.

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 Toyota Highlander, from QUALCAST and TOPLINE.

Part numbers include QUALCAST 1030532 and TOPLINE IVTO59.

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

DEA / MARMON RIDE CONTROL supplies both parts for the 2025 Toyota Highlander.

Part numbers include DEA / MARMON RIDE CONTROL A42154HY and DEA / MARMON RIDE CONTROL A42146.

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

36 Oil parts are listed for the 2025 Toyota Highlander, from VALVOLINE, MOBIL, LIQUI MOLY and 3 other brands. LIQUI MOLY 2208 carries the "Popular" badge. Grades run from Full Synthetic through High Mileage (>75,000 Miles); Full Synthetic is the most populated section, led by VALVOLINE, LIQUI MOLY, MOBIL and 2 other brands.

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

This group shows a single part: BECK/ARNLEY 0396661.

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

3 Oil Drain Plug parts are listed for the 2025 Toyota Highlander, from DORMAN and REIN. All of them fit every engine offered in the 2025 Highlander.

Part numbers include DORMAN 090038, DORMAN 090049 and REIN HWU0112.

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

3 Oil Filler Cap parts are listed for the 2025 Toyota Highlander, from CALORSTAT, GATES and MOTORAD. All of them fit every engine offered in the 2025 Highlander.

Part numbers include CALORSTAT OC2312, GATES 31285 and MOTORAD MO155.

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

16 Oil Filter parts are listed for the 2025 Toyota Highlander, from VARIOUS MFR, BOSCH, FRAM and 10 other brands. VARIOUS MFR PG4476 carries the "Popular" badge. All of them fit every engine offered in the 2025 Highlander.

In the Economy grade, VARIOUS MFR, BOSCH, FRAM and 2 other brands supply 6 parts: the catalog's value-priced group. A representative part number is VARIOUS MFR PG4476.

In the High Performance / Heavy Duty grade, MOBIL supplies 1 part: grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. A representative part number is MOBIL M1103A.

The Standard Replacement section lists 8 options from ACDELCO, BECK/ARNLEY, BOSCH and 5 other brands — built to original-equipment specification. ACDELCO PF1233 is listed in this group.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

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 Toyota Highlander — STANDARD MOTOR PRODUCTS FLS359.

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

2 Oil Pan parts for the 2025 Toyota Highlander come from 2 brands — DORMAN and SPECTRA PREMIUM.

This group includes DORMAN 266004 and SPECTRA PREMIUM TOP76A.

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

One part is listed for the 2025 Toyota Highlander — TOPLINE OPTO59.

This table covers the chains that drive the oil pump. Read more

5 Oil Pump Chain parts for the 2025 Toyota Highlander come from 4 brands — MELLING, JAPANESE OE, PREFERRED COMPONENTS INC and 1 other brand.

Listed part numbers: JAPANESE OE A05079AM, MELLING 1110 and MELLING 1084, plus the other parts above.

This table covers the Oil Pump Chain tensioners. 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

2 Oil Pump Chain Tensioner parts are listed for the 2025 Toyota Highlander, from MELLING and PREFERRED COMPONENTS INC. All of them fit every engine offered in the 2025 Highlander.

Part numbers include MELLING BT7064 and PREFERRED COMPONENTS INC T66361.

This table covers the Oil Pump sprockets. Read more

3 Oil Pump Sprocket parts for the 2025 Toyota Highlander come from 3 brands — MELLING, PREFERRED COMPONENTS INC and S.A. GEAR.

This group includes MELLING S1325, PREFERRED COMPONENTS INC G57020 and S.A. GEAR S1581.

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

This group shows a single part: TOPLINE PATO59H.

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

This group shows a single part: TOPLINE RSTO59.

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

5 Timing Chain parts for the 2025 Toyota Highlander come from 4 brands — MELLING, JAPANESE OE, PREFERRED COMPONENTS INC and 1 other brand.

Listed part numbers: JAPANESE OE A05078AM, MELLING 1109 and MELLING 1083, plus the other parts above.

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

11 Timing Chain & Component Kit parts are listed for the 2025 Toyota Highlander, from MELLING, PREFERRED COMPONENTS INC, S.A. GEAR and 3 other brands. MELLING 31083SX carries the "Popular" badge.

Economy: 4 parts, from PREFERRED COMPONENTS INC and S.A. GEAR. A representative part number is PREFERRED COMPONENTS INC TS17142.

The Standard Replacement section: 7 options from MELLING, INA, JAPANESE OE and 1 other brand. MELLING 31083SX is listed in this group.

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

9 Timing Chain Guide / Damper parts for the 2025 Toyota Highlander come from 3 brands — MELLING, PREFERRED COMPONENTS INC and S.A. GEAR.

Listed part numbers: MELLING BG7070, MELLING BG7071 and MELLING BT7088, plus the other parts above.

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

4 Timing Chain Tensioner parts are listed for the 2025 Toyota Highlander, from MELLING, PREFERRED COMPONENTS INC and S.A. GEAR.

Listed part numbers: MELLING BT7089, MELLING BT7062 and PREFERRED COMPONENTS INC T66360, plus the other parts above.

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

6 Timing Crank Sprocket parts are listed for the 2025 Toyota Highlander, from MELLING, PREFERRED COMPONENTS INC and S.A. GEAR.

Part numbers include MELLING S1323, MELLING S1324 and PREFERRED COMPONENTS INC G50300, among others listed above.

This table covers the gaskets that seal the valve cover 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

3 Valve Cover Gasket parts are listed for the 2025 Toyota Highlander, from BECK/ARNLEY and MAHLE / CLEVITE.

Listed part numbers: BECK/ARNLEY 0362084, BECK/ARNLEY 0362105 and MAHLE / CLEVITE VS50976.

This table covers the pressed-in bronze and cast-iron guides that align valve stems. Typical signs include oil smoke on startup, a guide that has gone oval, or a valve that no longer seats quietly. Guides are a machine-shop fit. Confirm stem diameter in the notes before ordering. Read more

TOPLINE supplies both parts for the 2025 Toyota Highlander.

Listed part numbers: TOPLINE EVGTO59 and TOPLINE IVGTO55.

This table covers the springs that close each intake and exhaust valve. Typical signs include a sagging corner, a broken coil, or a clunk from the spring pocket. Replace springs in axle pairs and inspect the seats. Read more

2 Valve Spring parts for the 2025 Toyota Highlander come from QUALCAST.

Listed part numbers: QUALCAST 325507 and QUALCAST 325508.

This table covers the Valve Spring retainers. Read more

This group shows a single part: MELLING VSR726.

This table covers the keepers that lock each valve-spring retainer to the stem. Read more

This group shows a single part: MELLING VL1100.

This table covers the seals on each valve stem that control oil into the guides. 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 Toyota Highlander — TOPLINE VSSTO34.

This table covers the oil-control solenoids that command the cam phasers. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same. Read more

One part is listed for the 2025 Toyota Highlander — WELLS 2T1306.