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I have had this car for two weeks now and have only put 92 octain fuel in. I also put a bottle of fuel injecter cleaner in the tank and have about a half a tank of gas left. The car only has 76k on it and is in great shape. The owner before me took really good care of the car. I am used to driveing a camery and a chevy so I dont know if Volvos run rough by nature. it doesnt seem to be fireing out of time, but just runs rough. I get all kinds of rattleing on the dash. I want to start to use a synthetic oil. Will that smooth it out? And what kind and wieght should I use.
Thanks
Erik N
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