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Stock air filter which was replaced at 30,000 miles. Thanks for the heads up nicrfe1370, I think I'm going to go back to changing it every 4000 miles to keep everything low.

it's regular mobil 1, not the new extended mileage stuff. I hadn't looked at it from ppm/mileage. I was looking at the rates of change accross the two tests. Comparing the two, the mileage went up by 41%. What had me concerned was that iron was up 55%, lead was up 600%, moly up 55% and zinc was...

I started running mobil 1 at my second oil change around 6,000 miles. I changed it every 3000 miles until last year when i figured i might as well try and extend it to 7500 which is what the Subaru recommends. My first analysis was done after 37,624 miles with 4427 miles on the oil. The numbers...