Just started using straight 40 weight Valvoline racing oil with zinc.
I may be all wet here, but it was always my understanding that multi grade oils were engineered to maintain their viscosity from cold to hot. For example, 10w40 the viscosity of the oil is 40 at start up and 10 at normal operating conditions.
I may be all wet here, but it was always my understanding that multi grade oils were engineered to maintain their viscosity from cold to hot. For example, 10w40 the viscosity of the oil is 40 at start up and 10 at normal operating conditions.