Question about 2005 Cadillac STS
The bigger your engine compression ratio is... the higher the fuel octane that you have to use to reduce carbon deposits. If you value your car and will keep for a long time then use the higher octane. Otherwise, use the low-octane since price of fuel is steadily going up. Your's to decide.
Posted on Oct 07, 2010
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Posted on Jan 02, 2017
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