I just saw Valvoline VR1 at autozone for $3.36 per quart!! A buck per quart cheaper than I paid.
What is the justification for the 20W50? That is some pretty heavy stuff, I would think straight 30wt would be better if you need that viscosity. Multigrades are never as good as straight grades because the modifiers take up volume in the
oil but add no lubricating properties, the multi grade offers the advantage of lighter weight when cold. 20w50 probably has the same viscosity as straight 30w, in other words 20w50 is not like a 50w when hot.