Walmart offers the Valvoline SynPower SAE 0W-20 Full Synthetic Motor Oil 5-Quart Bottle
, model no. 813460, for $22.97
charges the same with free shipping for Prime members.) Opt for in-store pickup
to dodge the $4.97 shipping charge. That's tied with our April mention and the lowest price we could find by $33. It purports to offer high temperature, sludge, and varnish protection.