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Old 09-13-2023, 01:55 PM   #7
radz28
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Drives: Ultra-Grin
Join Date: Oct 2006
Location: Crazy Coast
Posts: 15,789
It used to be Diablosport would say NOT to use Shell. That was a while ago, but one of my FI cars gets a little better efficiency from Shell. We only get 91 out here, so I wouldn't claim and performance benefits.
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