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Which gasoline ???

posted by  Turbo1002 on  Wed Jan 10 14:14 CST 2007
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last visit: Sat Dec 8 10:13 CST 2012
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Where I live the only octane available is 87, 89 or 93. My 1990 240dl volvo requires 91 octane. My question is should I use 89 and chance some detoniation and have the ecm retard the timing or use the 93 but then the motor will not be able to burn it correctly and carbon will build up. What are you doing?







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