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Not the original owner. It has a Jasper engine, 241,000 Miles ...I think it already had 200,000 miles when I acquired it. It does use some oil, but perhaps normal. I've used 5w30 in the past. That's is in the manual. Been noticing some warmer engine temperatures last summer, but nothing that...

Wondering if the higher zinc content in Shell Rotella T6 5w-40 heavy duty diesel engine oil would work okay or better in an '05 Buick LeSabre? When I purchased the oil, the reviews read that it works well in gasoline engines, but I didn't consider the stronger detergents and how they might...