I use midgrade...always have. But b16s are premium only...they run like shi-at if regs put it em
I dont think there is gonna be a big difference in power on a d16 from 87 to 91 octane though...its not a far enough gap for that motor.
It will keep your engine cleaner, and the injectors too, by using 91 (or 94 if you live on the east side (YAY Sunoco))
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