Quote:
Originally Posted by EnVe46
I don't agree with this, at all. The car requires a minimum octane level for a reason. Sure, one fill up isn't going to destroy it, especially if you drive it lightly. But continual use of subpar octane on a turbocharged engine is going to cause issues of some sort. Reduced performance might be the only issue but why buy a 500+ hp car to use fuel for a civic that'll reduce performance?!? If you can justify using proper fuel, go buy a 528 or something else that doesn't require higher octane.
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You are implying that lower octane will "detroy" an engine but then you say it will just reduce performance. Do you know what octane is? It has NOTHING to do with the quality of the fuel. So you can agree or not, I don't care, but know the difference between gas quality and octane. It is basic science.
In reference to why someone would use 87 octane vs 93 octane, it is because they don't need 575 hp on tap for a daily driver. So they would rather save $500/year instead of literally burning it up for no reason.
BTW, your base model 5 series example also has turbochargers but you recommend 87 octane for that car. This further makes your post even more confusing.