Subaru Valve Cover Gasket Replacement Cost
Replacement of the rubber gaskets sealing the valve/rocker covers to the cylinder heads to stop oil leaks onto the exhaust.
Why this fails
Heat cycling causes the rubber gaskets to become brittle and 'flat' over time, especially on EJ25 and older FB25 engines. Oil eventually seeps past the seal and drips onto the exhaust heat shields.
What the job involves
- Removal of the air intake box, battery, and washer fluid reservoir to gain lateral clearance.
- Unbolting and moving the ignition coils or spark plug wires.
- Removing the 10mm bolts securing the valve covers (often difficult due to the proximity of the frame rails).
- Cleaning the sealing surfaces of the cylinder head and removing old RTV sealant.
- Installing the new perimeter gasket and internal spark plug tube seals.
- Reinstalling the cover and torquing bolts to spec (approx. 5-6 ft-lbs) in the proper sequence.
If you delay this repair
Oil will leak directly onto the hot exhaust manifold, creating a burning smell, smoke, and a potential fire hazard. Long-term leaks will also saturate and ruin the rubber lower control arm bushings.
Save money
- • Always replace the spark plug tube seals and bolt washers at the same time; doing them later doubles the labor cost.
- • Combine this job with a Spark Plug change, as the plugs are already exposed and must be removed or moved to clear the covers.
- • Use a high-quality anaerobic sealant (like ThreeBond 1217H) only on the specific 'half-moon' or cam cap junctions to prevent future leaks.
OEM part numbers
FAQ
How much does subaru valve cover gasket replacement cost cost in 2026?
Expect $450–$750 at most US shops, parts plus labor.
How long does the job take?
2.5–4.5 labor hours typically.
Can I do this myself?
Yes — DIY difficulty 4/5.
What happens if I delay?
Oil will leak directly onto the hot exhaust manifold, creating a burning smell, smoke, and a potential fire hazard. Long-term leaks will also saturate and ruin the rubber lower control arm bushings.