Can API GL-4 Transmission Oil Replace GL-3 Oil?
A reader asks: I’m looking for an API GL-3 manual transmission oil for my 2006 Pontiac Solstice. GL-4 transmission oil is widely available, but I can’t find GL-3 oil anywhere. Do you have an oil that will work? Our answer: Yes, we do have a product that is safe for manual transmissions requiring an API…



