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Sorry, but I will stand by my assessment that it is unwise to spend the extra money on even a 228/30, let alone a 235/40, and then neuter the performance, while playing brinksmanship with some extra-expensive engine internals. Those 'guidelines' don't recommend 89 octane, they say it is the lowest safe to use. Like, you are stuck in the middle of Timbuktu and they are out of premium; not like you want to brag to your uncle about how little you spent on a tank of gas. I don't know why this brand of 'I'm smarter than everyone else' keeps rearing its head around here (its a BMW fan page - we all spent an extra 10-20 grand on the car, another 20 cents per gallon is not an issue to enjoy that potential).
And higher octane is never worse for the car (that I know of), just a waste of money in those cars that aren't ready to use it.
Last edited by Maynard; 02-13-2018 at 08:26 AM..
Reason: political correctness
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