BMW 5-Series Forum (G30) - View Single Post - New 540i engine rough and misses on cold start

High Flier · 09-10-2018, 11:51 AM

Get 93 octane if you can. Fuel does make a difference with the B58 engine. If you're stuck with 91 octane, try a different brand of gas.

09-10-2018, 11:51 AM	#6
High Flier Second Lieutenant 103 Rep 231 Posts Drives: 2019 M550iX Join Date: Mar 2017 Location: USA iTrader: (0)	Get 93 octane if you can. Fuel does make a difference with the B58 engine. If you're stuck with 91 octane, try a different brand of gas.
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