I was told (by my Mazda service manager of all people) that full synthetic oil could be harmful to my '09 5.7. My truck has very low mileage (only 75k), and I have always changed my own oil (every nine months/6k miles on average). It has had nothing but Mobile One full synthetic 5W-20 since its first change. Someone please tell me that this guy doesn't have a clue about Mopar engines. Thanks much.
Sun, 03 Apr 2022 12:19:10 +0000---------------------------------------------------------------------------
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