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Message: <blockquote data-quote="fabianyee" data-source="post: 52261" data-attributes="member: 6">Actually different fuel does affect the performance and engine smoothness... But then again, different type of engines oso can be a factor.... M20 may be good using brand A, then M50 may be good for Brand B, M54 may be good when using Brand D... And then engine health can also be a factor. take 5 of the similar engines ie M50B25 from E36 325i, test may return different feedbacks using the same brand and from the same petrol kiosk... there's a lot of variables involved if a proper were to be conducted... So use what u feel is good....</blockquote>