ralphduke724 said:
thanks for the reply. according to the 3.0 N54 i can use 95 RON fuel. but when i put in half a tank of 95 RON in my N52 2.5 the engine light comes on and until i add 100 or 98 RON then engine light on the dash doesn't go off.
I have the same problem. my engine is jdm spec and according to the label i can only use 98 or 100 RON without the engine light coming on. but accordingly to the 'experts' on this site we can use 95 RON because there is no difference in engines or exhaust or catalytic converters, fuel pumps, etc between countries and engines.
According to my correspondence with BMW they made all the E89's in the same factory but tailored the engines, heads, and injection, and fuel compression pumps to meet each countries exhaust requirements.
But like the times of old the Brit's keep the stiff upper lip (like keeping the military stuck to bolt action rifle's as standard up until 1955). Tuner's now put in new chips, remap the engines, put on ceramic headers and upgrade fuel pumps. but accordingly to the Z4 Nazi's here you can not have any more power than the Brit engine.
I posted my engine specs on dyno along with the compression ratio: i also admitted that my engine CPU was probably chipped and i have a ceramic aftermarket exhaust but they fail to accept it (how dare a M16 be better than an MK3*III Enfield!)
my advice on this forum is if they can't actually answer your question and antagonize you, then just ignore or block them.