AGAIN...what's the 'best' engine oil for me?

[hemioiler]

I think you're thinking of a 0w40.

Ah, that's possible. I'm just remembering that guys on the forum use RL 5w-30 over the 40 grades even in the 6.4 but it might be the 0w-40 that is a problem for shearing.

 

[Rand]

Some turbos don't use an auxiliary coolant pump because it's engineered as a thermosiphon to move the coolant even without a pump