Nothing Less in the weighting ??w/?? - (Viscosity) of the oil.

ie do not use 5w/50 or 0w/40 because as the oil temperature rises the oil will become too thin to provide protection for the engine. 15w/40...15w/50 is much better.

As for gearbox protection:

Redline Lightweight Shockproof Geal Oil a.k.a. SMURF SNOT
$120 for 1 gallon at last check.


And for all of you using Mobil 1 5w/50 . . . this is NOT a fully synthetic oil. (ok for GRANDMA STREET ONLY WRX drivers)
It is chock a block full of viscosity modifiers. The modifiers are the very first part of the oil to break down when oil temps start to rise

Grab some Castrol R 10W60 fully synthetic for the same price.

J.