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The oil is Mobile 1 fully synthetic 15000 mile oil. I buy the 5 quart container, but only use 3.5 in my car. I buy 5 oil filters at the same time and change them every 3000 miles, and use the extra oil to top off what I lose when pulling the filter. I have run several oil changes with this oil, and am just getting to yhe point where I feel comfortable REALLY going 15000 miles on a change. Up to now, I was changing the oil at 6000, 9000, and 12000 mile increments. When I drained it last time with 12000 miles and the oil had color left, I figured I would try 15000 miles.
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