Question about 1990 Cadillac Eldorado
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Posted on Jan 02, 2017
Castrol 20w-50 in summer and 10W-40 in winter, is best in my opinion.
It is high detergent, to remove sludge.
The thinner oil, like 5W-30 is only for better mileage, but cause piston and camshaft wear.
Posted on Oct 07, 2010
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