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  • 4 weeks later...

Can non-premium fuel mess with your idle and effect detonation? also what else does premium fuel do for your car that the low grade fuels cant?

In the SC400 you need to use premium to prevent detonation. Premium fuel does little else. It is designed to be able to be compressed more than regular fuel without exploding, (detonating).

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  • 2 months later...

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