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Does the UK M5's run on superunleaded or normal unleadeed as it is getting difficult to find garages that have super?
My last car (m3) used super so I am expecting this to but it is a major pain.
 

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For optimum performance and economy BMW recommend Super Unleaded (98 RON) but the minimum it recommends is Premium Unleaded (95 RON) although the assumption is that performance and economy will suffer at this level. I use Super but then company pays for petrol!!!
 

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anyone have the conversion from RON octane to whatever octane rating is used in the US? standard high octane at mobil or exxon is usually 93. i think i remember seing something like R+M/2 on the pumps ...
 
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