Originally Posted by tazracing
I have to been using vr1 20/50. One of the engine builder around my area
said you pick some from the lighter oil and to use rotella t. thats why i asked. I have a deal with my local advance auto that only pay 2.50 per ot
for the vr1.
I switch to the vr1 10/30 if I want to pick up a few, usually .05 faster then the 20/50.