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I've run 5W40 in my 2006 for a few years with great results (Red Line). Then switched to a 5W50 oil (Mobil) with slightly better results. In about 2 weeks, I am switching again to Joe Gibbs 5W40 DT40 oil (Jake Raby approved).
Just rolled over 51,000 miles. Car is ROCK solid.
My UOA's support my choices.
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