Motoring Q&A: Oil types, radio troubles and long-term storage Post-Bulletin Q: Could you please bring me up to speed on the different oils now used in car engines? The oil fill cap on my new Buick reads "Dexos 5W-30," whereas my 2002 Oldsmobile Bravada oil cap reads simply "5W-30." The Bravada has 78,000 miles on it. |