Quote:

What viscosity should I buy for the midwest. All 440's 6V's and 383 HP's. My 383 RR I hope to drive the wheels off of! No driving during the winter.

10/30
10/40


I did find a place in KCK and Marshall, MO that are distributors.



Let your engine(s) tell you what weight likes... if hot oil presure is good with 10W30 than that's what I'd run. If a little low, run the 10W40. Generally engines built with stock or near stock clearance do fine on 10W30. Engines with hi-po clearances may like the 10W40, especially if you do street driving that may force you to idle while hot for a while.