xrtdac

what brands and if I can use the thinner 5W20 or not.
Built B18B1 to a 1.9L running a turbo set-up on 15PSI. trying to squeeze a lil more power out of it with fresh thinner oil but unsure if it is ok or not. any thoughts?

5W20
5W30 (currently using mobil 1 of this)

xrtdac

And I did do a search and there wasn't really any attacking of this aspect of thinner oil.

xrtdac

forget it. you can delete this thread. I have decided to go with a
10W30 turbo formulated Amsoil.