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To the OP why not send off an oil sample for analysis ? We car owners have lots of opinions on oil , why not let an oil analysis be the referee ? Just my opinion but no one regardless of their expertise can just look at oil on the end of a dipstick and make an educated decision on change or don't change . Unless the oil is pitch black .
I am NOT challenging anyone's advice that has been given , just suggesting that let an oil scientist inspect your oil sample and give feedback on that analysis . What do you have to lose ?
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