Dyno test results stock untuned bmw 335i turbocharged. Jb4 rb upgraded turbos exhaust dci meth injection. N54 500 Whp 93 Octane Hybrid 17t E90 N54 335i Build If a gas station is out of the minimum rating you need simply just go to the higher octane fuel with no issue. Bmw 335i octane . The easiest way is to look inside the fuel door for the minimum octane rating recommended by bmw. Do not use octane booster its a waste of money and isnt going to help. Putting low octane fuel in a car with a high compression engine could cause the engine to knock or ping which could cause major damage if it goes on for a long time. Various jb4 dynos from a 2008 135i with bms dci exhaust and intercooler. Turbo charged vehicles like your bmw 3 require a higher octane fuel to prevent knocking due to the higher cylinder pressures in your engine. I think bmw actually recomends against fuel additives in the owners manual. Filling up your bmw or any other car with premium gas can hurt you...
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