Honda Odyssey Oil Leak: Valve Cover, Driveshaft and VTEC Seals All Fixed in One Visit

The owner of this Honda Odyssey noticed oil spots building up wherever the car parked. The underside was oily and wet, and the engine oil level was dropping faster than it should between service intervals.

On an MPV that moves the family around every day, an oil leak is not something to ignore. Low oil pressure damages the engine. And on a Honda Odyssey, with its VTEC engine and automatic transmission, the oil system has more sealing points than a simpler car. The owner wanted every leak found and sorted in one visit, not chased one at a time across multiple trips.

We put the Odyssey on the hoist and cleaned the underside to start from a dry baseline. Once clean, we ran the engine and watched for fresh oil appearing, tracing each wet spot back to its source.

The valve cover gasket had cracked at the rear of the engine and was weeping oil down the block. The VTEC oil seal and its o-ring were seeping oil from behind the camshaft pulley. The main pulley oil seal was leaving a ring of oil around the crankshaft nose. Both driveshaft oil seals were leaking where the shafts enter the gearbox casing. The auto cooler gaskets on the transmission cooler lines had hardened and were no longer sealing cleanly.

We showed the owner photos of each leak point before quoting. The scope was clear: five leak sources, all serviceable, all fixable in one visit.

With the owner's go-ahead we addressed every leak source at once.

• Removed and replaced the valve cover assembly with a new gasket and plug seals.
• Removed the camshaft pulley and replaced the VTEC oil seal and its o-ring.
• Removed the crankshaft pulley and replaced the main pulley oil seal.
• Pulled both driveshafts and replaced the driveshaft oil seals at the transmission casing.
• Replaced the auto cooler gaskets on the transmission cooler line connections.
• Refilled with fresh transmission oil to the correct level.
• Did a full engine oil and filter change so the car went home with clean oil through the freshly sealed system.

All parts were OEM-grade replacement seals and gaskets. After reassembly we ran the engine to operating temperature, re-checked every sealed joint for weeping, and road tested before handover. The car went home dry.

What a multi-seal repair costs depends on which seals are leaking and how many need replacing. This job, covering the valve cover assembly, VTEC oil seal and o-ring, main pulley seal, both driveshaft seals and the auto cooler gaskets, plus transmission oil and a fresh engine oil and filter change, came to roughly $1,600 to $1,700 before GST.

What determines the cost is the number of leak sources. A single valve cover gasket is a small job. When several seals have aged together, it makes sense to address them all in one visit rather than bringing the car back multiple times. With the car already on the hoist and the engine cleaned down, finding and fixing five leak sources at once saves significant labour cost compared to doing them one at a time.

We quote for exactly what is leaking, confirmed with photos, before any work begins.

This Honda Odyssey (Engine oil seal and gasket replacement) was handled at 1 Car Service, an independent workshop in Sin Ming AutoCity, Singapore. We hold a 4.9★ rating from 1,775+ Google reviews.