That's the best, run the P.il and then change the oil.I changed the oil in it yesterday. Two weeks before I did, I put 2 bottles of Amsoil PI in the tank and filled it up. Drove that tank out and filled up again. I have that tank down to almost a 1/4 tank. When I changed the oil, that nasty crap was black as could be. I'm sure the PI did some thorough cleaning. I think the old pig was happy to get some new blood and a filter.


