Question about 1994 Buick LeSabre
If it's an engine that's never been rebuilt, I would use 20W-50, High Mileage formula, non-synthetic.
20w-50 for the Summer,
10w-40 for the Winter.
High Mileage Formula reconditions the seals.
Synthetic molecules are smaller than non-Synthetic. So, you don't want oil to go through the gaskets easier. Non-Synthetic is best.
Posted on Jun 02, 2009
I'd use 5 w 30 in cold or cool weather, then switch to 10 w 30 or, 10 w 40, when it gets hotter.
Posted on Jun 01, 2009
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Posted on Jan 02, 2017
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