Gmc 2500 HD ru s and drives shop said it has a small rear engine seal leak but i daily drive it and have not see any oil on the ground, has older gas in it I sat from 2017 tell last week, has bran new starter new tires 4x4, need and front window everything works as it should. I just changed the passagner side coils comes with all nee plugs, it smokes some times shop confirmed it was not a head gasket they said it just needs to be driven and could use an oil change. Looking to trade for a half ton of same vaule must be 4x4 not over 300,000 km. 306-450-1986