VW Oil Conversation - why 40 weight?

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Originally Posted By: Quattro Pete
There's probably a reason why VAG dealers use it. It must be the cheapest stuff out there that still meets the spec.
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However, the few long UOAs I've seen on it didn't look out of ordinary, for whatever it's worth. As usual, we are possibly overthinking things here on BITOG.


I am more concerned what that oil leaves inside the engine.
 
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