All Things Mk5 > How to Guides / Troubleshooting

Bad oil leak

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LC5F:
That picture looking up at the block - that's been leaking there for a very long time.
Looks like its the gasket seal between the block and the oil filter/heat exchanger was weeping, changing the oil filter holder has disturbed it making it worse.

pudding:
Hmmmm, those drips are nowhere near the oil filter housing.  It's all on the left side, which could either be a bad crank seal, bad cam cover gasket or a bad camshaft seal.

Worth also checking the turbo oil feed line in case that's leaking and wicking round to the side of the engine.

If oil can be seen dripping out from behind the cam belt cover, it's likely the crank or one one of the cam seals.

If it is the crank seal, that's the worst one but not that bad in parts. Around £20 for the seal with tool from Elring, £16 for the diamond washer and a fiver for the crank bolt. All are one time use.  The worst bit of the job is removing the crank bolt if you don't have a beefy impact wrench.

rubdub:
Cheers lads.

Sorry I wasn't very clear on that. The oil filter housing was a second oil leak which has thankfully been taken care of now. But will check out those areas you both mentioned for the other leak.

pudding:
OK cool.  Just to confirm, the last pic is behind the metal boost pipe yeah? If so, unfortunately the crank seal could be a suspect.  Not common for that one to go on these engines to be honest, but not unheard of.  Hopefully it isn't that.

If you're lucky, oil from an easier seal to fix has crept round that to that side?  Are you 100% sure you didn't tip oil past the filler neck?

Stupots:
I’m gonna say it could well be the rocker cover seal. Have you got an endoscope or even your phone down the back of the rocker cover?

When some people do maintenance and have the rocker cover off they often put silicone on to refit, bad idea!

Seen multiple Golfs with this issue. They rocker seal should be fitted with no silicone (well just a spot either side of the cam journals) and replaced if damaged. People also over tightening or thread the rocker cover bolts when they have a built in spacer to set the correct gap.

Hope you find the issue soon.

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