So I have a loaner Chevy cruze whIle my focus is having the paint issue fixed. The cruze is a nice little car. But why does gm have to have dexos approved oil and ford doesn't hAve an particular spec. My manual says anything api sn approved is fine. Are ford's ecoboost engines similar to this as they do not require a synthetic? Seems to me I'd want to use synthetic if I had a turbo engine.