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Q: what's the best type of oil for my engine? on 2001 Cadillac DeVille DTS

I need an oil change and would like to buy the best in order to keep my Cadillac running well!
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When it comes to engine oil everyone has a preference or anecdotal evidence why one oil is better than another. The key to long engine life is frequent oil changes! Synthetic oil is great but expensive Redline or Mobile1 are great, Any of the name brand oils are good I use Chevron in my cars and change every 3000 miles and put big mileage on all my cars with no problems.
amsoil is the best oil for a car but its hard to find and at 11 dallars a qt 25000miles or one year between changes if you find it castrol egde is second royal purple is third
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