I go atleast 10K on mine and I don't use any special oil. I have 220,00+ on my van and it still runs fine. Had over 250 on my last van and it still ran fine. I had over 300,000 on a mercury couger with a 5.0, same motor as the mustang. I did not change the oil for over 100,000 miles just added it as needed and change the filter a couple times. The car fell apart around the motor, reason I did not change the oil i wanted the car to die.
Re: pure synthetic oil
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