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Old 07-06-2015, 02:19 PM
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X5only X5only is offline
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Originally Posted by Omerta View Post
LOS basically increases the oil viscosity making it more difficult to leak through the valve seals. Its not a fix, it only creates an acute fix for the burning, while causing more chronic problems down the line from additive displacement, foaming and reduced flow during coldstarts etc.
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?
'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.

Last edited by X5only; 07-06-2015 at 02:24 PM.
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