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      04-13-2014, 09:20 AM   #15
MysticBlue
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Drives: '20 M5C, '09 M3 DCT Coupe
Join Date: Apr 2008
Location: Eastern Oregon... They call 'em rigs here

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Quote:
Originally Posted by chrisny View Post
This assumes 91 is actually available, which it isn't in many places... Even then, not sure I agree, but I'm no expert and 91 isn't readily available where I live, so I stick with 93 and waste $2 a week
Well, under the circumstances, yes, you are doing the right thing. If 91 is the recommended minimum, and your only choice is 89 or 93, then yes, 93 is the right choice. Higher octane than needed certainly won't do any harm and you will get the same added benefit that you would get from 91. Just don't think that since 91 is good, 93 is even better. It doesn't work like that. If the design and compression ratio of an engine call for 91, 93 won't make it any better, in any way, than 91. It would perform exactly the same. But it's better than 89.
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