[BiturboS4] 10k service - OK

[Chip Goetzinger]

<<I get better lubrication with the thicker oil.>>

This is only true when the oil gets where it needs to be.  The requirement
for easy flow characteristics is due to tight engine machining tolerances
and small oil passageways that need significant flow to provide lubrication.
Our turbos have no bearings, they ride an a layer of oil.  If your oil is
too thick to get to the turbos IMMEDIATELY upon startup (with high cold
viscosities, it will take time to ooze through tiny passageways), for
instance, you will damage the turbos.

--Chip