I change the oil in my truck twice a year spring and fall how ever many miles I don't care. Usually it's about 4-5k but not worth keeping track. The full synth stuff will last 10k easyWhen you really get down to it, these oils are some of the best and capable of lasting thousands of miles longer than what we put on them anyway, I change the oil yearly or every 2000-2500 miles anyway. I run Mobil 1 in all my vehicles and again, I change it yearly or every 4000 miles, but I buy it when its on sale and for $4.50/quart, which is the price of regular oil, why not change it.
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