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Q: Can I use regular fuel instead of premium ? on 2000 Cadillac Eldorado

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I have a 2000 Cadillac ElDorado w/ 105,000 miles.
(2) Answers
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I think Cadillac called for 91 octane on that car the engine has a knock sensor and diminishes performance if it detects detonation due to lower octane fuel. Check your owner's hand book and or call your Cadillac dealer see what they advise.