i believe unless you buy the good stuff, it only raises the octane one number to like 88 octane instead of 87. I believe the cost would be more to make 87 become 93 octane.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual