Originally Posted By: jsjonz01
I just wrote Valvoline an e-mail today asking what base stocks are used in formulating the Synpower and if the oil met GM4718M, below is their response:
"Our Valvoline SynPower 5w30 does meet the performance requirements for the GM 4718M specification. We use a premium Group IV basestock for our SynPower motor oils."
Looks like an excellent oil for $18.97/5 quart jug!!!
The thing is, they say they use Group IV, but that doesn't mean that it's all Group IV, it could be 1% Group IV for all we know.