Technical Need advice

STE92

Corporal
Mar 3, 2017
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E92
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I have an 07 335i ST w/151k, car runs great on jb4/BEF. Upgraded to external catch cans/BL coils and while swapping plugs found cylinders #1 completely cover in oil. Proceeded do a compression test dry/wet cold/warm/hot compression was perfect. Barrowed a leakdown tester and also passed with flying colors. I hate to throw money at it without knowing exactly what’s wrong with it. Few things I noticed, car seems to be getting a lot of blowby, burning through oil but not a lot of smoke, see the occasional puff at start up. When you open up the oil fill cap seem to have excessive crankcase pressure. Can this be cause by a cracked internally or bad seal VC? Any ideas are welcome. Really appreciate the help.
 

MDORPHN

Corporal
Jan 28, 2018
196
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BMW 1M
Dunno but the oil on threads suggests it may have leaked down from the spark plug well. But I can't figure how oil -- most possible from a tired valve cover gasket -- would have leaked down onto the plug like that unless the spark plug was way loose.
 
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