i tried changing the oil at 7500 but after 2500-3000miles my engine keeps burning oil like hell, i would have to add oil every other day, plus when i changed it at 6000miles the oil was too thick and dirty (a lot thincker than the oil that went in 6000 miles ago) so i will change it every 3000 miles no matter what. as for oil filters i used the purolator pure one filters and i would get the oil light to turn on after punching the car. that never happened with the cheap ass fram filters, plus my oil comes out a lot cleaner with the fram than any other brand i used. keep in mind this is just a personal observation and not an actual test, and yes the car is just few clicks away from 160k miles on the dash
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