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the test kit is free, the test is $22.50 and I recommend spending the extra $10 on a TBN test [the first time, or periodically] if you're interested in an extended oil change interval. I've gone as far as 6000 miles between changes without problems in the sampled oil. I did 4100 miles AND a road course track event on this oil where my thermostat stuck shut and the car got as hot as i ever got it.
the test kit is free, the test is $22.50 and I recommend spending the extra $10 on a TBN test [the first time, or periodically] if you're interested in an extended oil change interval. I've gone as far as 6000 miles between changes without problems in the sampled oil. I did 4100 miles AND a road course track event on this oil where my thermostat stuck shut and the car got as hot as i ever got it.
Total Base Number. It is a measure of how much "life" is left in the oil, for those who are interested in seeing how far they can go between oil changes.
3,000 miles between changes is a mantra spouted by the oil companies to sell you oil more often...part of the point of synth oil is the extended interval between changes.