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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > N52 oil leak, please, what is it?



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      05-30-2023, 06:08 PM   #1
David9001
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Unhappy N52 oil leak, please, what is it?

It's been leaking for quite a while but rarely so I never really looked into it. I powered washed my engine bay this afternoon to remove all the grease and oil and when I went for a quick ride, bunch of smoke started to come out and some oil burning. I took videos and looked online for similar problems but it could be so many different things and it's a pretty serious/expensive job so I want to make sure I'm going to fix the right thing. Any heads up?

https://www.youtube.com/shorts/QO_kKfoPSi4
https://www.youtube.com/shorts/3CgcqisRcF8
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      05-30-2023, 06:17 PM   #2
Twix
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Valve cover. May as well do oil filter housing and I’ll bet $1 the oil pan is leaking like a sieve
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      05-30-2023, 06:24 PM   #3
David9001
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Quote:
Originally Posted by Twix View Post
Valve cover. May as well do oil filter housing and I’ll bet $1 the oil pan is leaking like a sieve
Valve cover cracked or just the gasket you think? Wouldn't oil be leaking on the floor if it's the oil pan? When I don't drive the car it doesn't leak (at least not as I know of), it starts leaking and smokes usually when I turn a corner too fast
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      05-31-2023, 01:40 AM   #4
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That's definitely the valve cover gasket.

You can change the OFHG just for peace of mind if you want.
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      05-31-2023, 08:44 AM   #5
AdrianE36
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If you're getting smoke from hard cornering, I'd say it's the Valvetronic actuator gasket. Those are notorious for leaking either from not being seated correctly or from age and oil will pool up in the recesses under the actuator in between cylinders 3 and 4.
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      05-31-2023, 11:49 AM   #6
David9001
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There’s oil here too, would there be oil there if it was the valve cover or is it the valvetronic actuator like he said?
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