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Old 07-06-2015, 03:28 PM
Omerta Omerta is offline
Join Date: Nov 2013
Location: Alberta, Canada
Posts: 119
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Originally Posted by X5only View Post
Interesting. Do you have a direct experience with LOS? Would using a high viscosity oil instead of LOS cause the same problems you mention? I spoke to a mechanic about my valve stem seals issue and he suggested to use a heavier oil such as Mobil 1 High Mileage 10W-40 if I want to delay a proper fix.

DavidClass, do you have any issues with cold start that Omerta mentions?
I've used LOS in a 2000 TDI Jetta I drove to 450k

It would cause the same problems with a lower viscosity oil minus the foaming (air entrainment).

Since the smoking is when the oil is hot, you would likely need to up the oil to a 10W50 or so to compare... but that effects your VANOS, cam followers, chain tensioners, and all hydraulically operated parts as well. Not an acute problem, so you won't likely see a smoking gun for a while.
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