Quote:

[ The (above mentioned) valvoline racing oil is considered a street oil



Im not sure what you are asking. The VR-1 available at most auto parts store has a API SM rating on it, hence no zinc.

The good Valvoline says "Not for street use", but in theory any oil without a API rating is not supposed to be used on the street.

72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72. Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.