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What octane gas should be used in a 2004 chevy express 1500 van with 4.3liter?

The 2004 Chevy Express 1500 with the 4.3L engine calls for regular unleaded gasoline (87 octane). Your owner's manual will confirm this, but it's the standard recommendation for that engine. Using a higher octane fuel won't hurt it, but it's unnecessary and a waste of money.