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I'm currently using Auto-RX in the oil and Marvel Mystery Oil (MMO) in the gas. The car is liking the combination. The ARX I've used before, but I'm running another cleaning to counteract any molestation of the engine that might have occurred when I replaced the intake manifold gaskets. The MMO is making the fuel pump quieter, and the car idles a touch smoother.
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2012 Chevrolet Cruze Eco 6MT
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