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You listened to someone that worked at Pepboys? And they were wrong. Honestly, it says what weight to use on your oil cap and in your owners manual. Even if you used 10W-30 synthetic I still think your engine will have an "easier" time reving with 5W-20 synthetic or not. Its all mental. you want to believe that it runs better. Probably a little smoother cause its a thicker oil which provides a thicker film of oil between metal parts.
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