Our 99 Trooper has 140k and had started to use more oil between changes, I was having to add about 1-1/2 Qts every 3k. I switched to Mobil1 5w40 diesel oil (Truck & Suv) and after several changes I have seen the consumption start to drop. Diesel oil has a much higher detergent level than reg oil and has additives to keep soot etc in suspension, so maybe it doesn't settle out as easily. Will keep you guys posted.