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Any issues running 98 octane in 4.4 X5? Any issues running 98 octane in 4.4 X5?
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Old 12-23-2009, 07:43 AM
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Any issues running 98 octane in 4.4 X5?
Hi All,

I have usually always used 91 octane petrol in the past, however, I seem to have got a bad fill and put 98 to give it a boost. After a few fills of 98 the engine response now feels much better but was just wondering if there would be any long term issues constantly running on 98 octane. Does it make the engine run hotter? Does the fuel mixture need re-tuning? Any downsides apart from the extra cost at the pump?
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