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Dave Elliott · Mar 3rd, 2008, 09:50 PM

Quote: Originally Posted by superunleaded (original)

I agree with the last poster. I have an Auto MCS and I have tried high octane (Shell Premium). The best way I can describe the change is that the car becomes hyperactive, jumping from standing start with much more frantic acceleration, rapidly spinning the engine and changing gears more frenetically. It becomes almost impossible to sqeeze on the throttle in a controlled manner. With standard unleaded the car becomes more civilised. It holds the gears longer. It is as if the car is designed for regular unleaded.

Not sure where Superunleaded is from, so perhaps the Shell Premium he speaks of is of a higher octane rating than the 95RON in Australia.

Just to clarify my post: I have run my 2002 MCS for over a year on BP Ultimate (98RON) and just changed to Shell Premium (95RON).

Shell Premium (95RON) has made the MINI smoother and more responsive. Cold-start problem is not as evident and the yo-yo has all but gone.

Traffic-light starts used to be a real problem when running on 98RON. The car would sometimes lurch forward and then bog down. With 95RON there is no hesitation and the power can be fed in smoothly. It's certainly easier to drive, if not a bit faster.

Cheers,

Dave

Mar 3rd, 2008, 09:50 PM	#43
Dave Elliott MINI2 Regular Join Date: Oct 2004 Location: Fremantle Local Time: 06:37 AM Posts: 129 Offline	Quote: Originally Posted by superunleaded (original) I agree with the last poster. I have an Auto MCS and I have tried high octane (Shell Premium). The best way I can describe the change is that the car becomes hyperactive, jumping from standing start with much more frantic acceleration, rapidly spinning the engine and changing gears more frenetically. It becomes almost impossible to sqeeze on the throttle in a controlled manner. With standard unleaded the car becomes more civilised. It holds the gears longer. It is as if the car is designed for regular unleaded. Not sure where Superunleaded is from, so perhaps the Shell Premium he speaks of is of a higher octane rating than the 95RON in Australia. Just to clarify my post: I have run my 2002 MCS for over a year on BP Ultimate (98RON) and just changed to Shell Premium (95RON). Shell Premium (95RON) has made the MINI smoother and more responsive. Cold-start problem is not as evident and the yo-yo has all but gone. Traffic-light starts used to be a real problem when running on 98RON. The car would sometimes lurch forward and then bog down. With 95RON there is no hesitation and the power can be fed in smoothly. It's certainly easier to drive, if not a bit faster. Cheers, Dave