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1989 Sedan DeVille is now just a fond memory ....
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Use the grade noted on your oil cap, probably 5w30. Which to use? That'll bring 'em out of the woodwork fer sure! Thanks for opening up a can of worms!. OK, j/k. Most oil sold for cars is blended to at least a minimum requirement and will do what it's suposed to in your engine.

Bottom line, put what you are comfortable with. Dino, synthetic, as long as it is clean and changed at the proper time either will work just fine.
 
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