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When to use 91 octane fuel?
AKI or RON?
320i manual says 87 ( with anti knock index ) or 91 ( research octane number ).
What's the way to go?
It's my nephew's car and it seems to be running a little hot.
He uses 87.
KT
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'74 914-6 2.6 SS #746
'01 Boxster
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