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I actually run 10/40 in winter and 20/50 in summer for my engine oil. It runs much better with more weighted oil IMO. My bud recommended it and I love the change in idle and smoothness. I would tell you to give it a shot in your engine if you have over 100k miles, that's what I was told to do.
The thicker weight is easier for the pump to move up to the top of the engine. And we all know that start-ups are the worst time for engine wear.
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