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What octane for Cadillac eldorado etc 1999 32 valve north star?

The 1999 Cadillac Eldorado with the 32-valve Northstar engine requires premium unleaded gasoline with an octane rating of 91 or higher. Using lower octane fuel can lead to decreased performance, potential engine damage, and could trigger engine knock sensors. Always use premium fuel as specified in your owner's manual.
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