N62 engine valve stem seals

[Omerta]

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.

[X5only]

Originally Posted by Omerta

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?

[Omerta]

Originally Posted by X5only

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.