I am getting delivery of my e90 in august and I'm pleased with the reports from all of you about the improved gas mileage being in the upper 20's to even 30 in some cases. This being my first BMW I was curious if you must use premium fuel? If you do or don't what would the results be on your performance and or vehicle? Thanks to all you experts)))))
Reply » Regular unleaded or Premium fuel?
the manual and the gas cover both state unleaded premium with octane 91 and above to maintain the life of the engine. Anything below, and it says it will make a knocking noise in the engine. I'm not sure if it will damage the engine though.
Reply » Regular unleaded or Premium fuel?
My feeling is that you will definitely lose some horsepower, and it maybe cause some engine problems over time if you continue to use regular unleaded. Your car will have to retard the ingnition to prevent detonation, but if you don't drive hard it probably won't be that noticeable. (Like on the freeway, for example).
All that being said, you really should use Premium because that is what the manual states. The compression ratio in our cars is pretty high so the car might have to retard ignition pretty severely with Regular, which could eventually cause problems.
Reply » Regular unleaded or Premium fuel?
If you are worried about the cost of premium fuel, you probably should have bought a Honda V6. Not very many V6 run on regular.
Reply » Regular unleaded or Premium fuel?
Quote:
If you are worried about the cost of premium fuel, you probably should have bought a Honda V6. Not very many V6 run on regular.
Reply » Regular unleaded or Premium fuel?
Quote:
If you are worried about the cost of premium fuel, you probably should have bought a Honda V6. Not very many V6 run on regular.
wow Mitch I guess asking a question that might have to do with saving a few dollars irritates you. What is it tonight there are some really cocky responses. Could you please supplement me a tank of premium as I don't have two nickels to rub together in comparison to you. But maybe you are always a smart
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Regular unleaded or Premium fuel?
