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it probably takes 10-W30 or 5-W30. I like Valvoline but have used Quaker State, Penzoil,Esso, Texaco.

Various weights of motor oil also depend on how old the engine is (which is another way of saying, how large the tolerances between moving parts has grown), how cold it is when you start the care (40 weight turns to mud at -20F), how hot you'll be running the car, etc. 10-W30 or 10W-40 would likely be pretty good for you. Talk to the dealer if you aren't sure.

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12y ago
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Q: What type of oil does a 1993 el dorado take?
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