Originally Posted By: Deer_Slayer
can you find Amsoil oil and filters in stores?
Some Napa's here in Texas carry Amsoil, but you usually have to to go online to get it. I run Amsoil in my Duramax and do 20-25k mile runs depending on what the UOA says, which I do every about every 7k miles. I also run a bypass filtration set up. My last run went 24.5k and I changed due to a couple of numbers I didn't like, though the oil was more than good for continued use. It just had more silica than I was comfortable with. Take into account though that my truck sees a lot of heavy towing and gets about 25k a year put on her. I think the point with the 25k claim is that the oil wil easily last that long with out breakdown, sludging, etc......but if the oil gets dirty from heavy or severe use, no oil can fix itself that way. Good filtration can help, but only to a point.