[Shop-talk] Oil analysis - Blackstone

[David C.]

OK, I have a 1986 BMW R80RT (motorcycle) with pushrods and solid 
lifters.  Any recommendations for oil for a vintage engine (I have been 
using GTX 20W50).  Aero oils?



John Miller wrote:
>
> For older engines, especially flat-tappet pushrod engines but really any
> engine with a lot of bits that slide on each other under high pressure,
> it can be a very bad thing.