Switched to Premium, Running Rough
#1
Switched to Premium, Running Rough
My wife received her moms used car and is now letting my drive her Audi A4 2009. She had been running regular and I read that premium is the way to go. But now when I come to an idle and park it's starts knocking and idling rough. Is the car used to regular now and the premium messed up the compression ratio? Really can't afford to ruin this car so please help! Thanks.
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GodfriedtheGuardian
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01-14-2013 10:04 PM