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[JamesV6CDX]

For a while my MV6 was leaking from the camcovers - stank when hot.

I changed these for gen GM gaskets, fitted with correct sealant and squeaky clean breathers. I also manually cleaned the engine afterwards as best as I could.

The oil stink went away, but even 2k miles later, there is still a whiff.

I had a good look at this from underneith (while I had the gearbox and cats off) to see if I could determine where it was coming from.

There seems to be oil dripping off the bolt heads of the heat sheild on the UNDERSIDE of the 2-4-6 exhaust manifold

There is also some dripping from the oil filter housing, and some where the bellhousing meets the engine

I keep my engine oil changed very often, and it's clearly nice golden engine oil, not red ATF.

I've taken off the plenum and the inlet gubbins and checked the oil cooler unions in the V - they are all dry as a bone. From the rear of the engine, with the gearbox off, I can see nothing leaking down the back.

Does anyone have any other instinct as to what this leak might be?

It's not big enough for the level to radically drop or leave puddles on my drive, but it is enough to cause an annoying whiff of oil now and again, which is driving me nuts!

The usual culprits I think are all eliminated.

Just thought I'd share in case anyone else has come across it..

[Kevin Wood]

I can't think of much except cam covers that could leak from as high as the exhaust manifolds.

Are the oil cooker pipes by the oil filter sound? Is the oil filter housing leaking?

[kcl]

Cooler pipe to block unions? That's where my engine weeps at the moment, the other union is maybe cross-threaded 

[Entwood]

Is the oil filler neck correctly seated if not it may leak from the base when engine running

[JamesV6CDX]

Is the oil filler neck correctly seated

Yep

[amba]

I am convinced that it ws secret design built into all Omegas when new.

They leak oil and no matter how hard you try and seal/stop/plug every possible orrifice and fit genuine gaskets /sealant etc they are just going to leak something,somewhere.

My car has covered over 200k and for the 165k of my ownership it has leaked oil/coolant and also atf albeit it in very small quantities.I keep a very close eye on all levels and they never really drop much but are regularly topped up and replaced with new as per service schedule.

Think its just one of those things and can almost drive you crazy trying to stop them.I gave up a long time ago and unless it is causing a major issue and having a secondary effect elsewhere I would be inclined to just live with it .At least it stops them rusting away any quicker.

[feeutfo]

Other than possibly leaking o rings in the oil filler neck(easily fixed by plugging the filler cap in instead) without seeing it, I'd have though this would just be residue left from the cam covers, no?

[VXL V6]

What's the oil pressure like at idle and high revs? Doesn't really matter what seals and gaskets you replace if the oil pressure relief valve is stuck.

[LFF64]

I had the oil filler tube leaking last week after changing the spark plugs  I thought I had disturbed the cam cover some how but after taking the filler off again and turning the O ring over the leak has stopped even thought it does not feel as tight as when I originally took it off

[robson]

Taking mine to workshop tomorrow in attempt to find where an oil leak is coming from.seems to be below oil filter,  crank sensor level, as said in another post not enough for a pool of oil but annoying. Did you locate your leak

[amba]

You might find the 2 oil cooler pipes above the filter are leaking.

I had a similar leak and always thought the oil filter was loose but could never understand why but on closer investigation the crank sensor was also quite wet.Got crows foot spanner on the oil feeds and found they were both slightly loose..gave them both a slight nip up and had no further problems since.

In that area only other thing is those cam covers,but you think it is below the oil filter ?

[robson]

Thanks Amba will look in that area tomorrow.

[RobseyMV6]

Crank sensor seal ok? seen them leak from there before

[05omegav6]

Not to be a doom merchant James

But when you changed the gearbox, did you remove the flywheel? Any oil at the bottom of the bellhousing is most likely to have come from the crank seal If there isn't an obvious leak from the top of the bell housing then sadly there's only one place left to look... at least the downpipe bolts should undo easily enough

[Marks DTM Calib]

I would also be checking the oil cooler to block joints as already said by others, do you know if its had an oil cooler change per at some point per chance....