My 1986 trooper burns oil too. it does about 125 miles a quart. I am rebuilding my 4dz1 motor and putting a stage 1 cam in it and boared the pistions 30 thounsands of a inch which displaces the motor at a 2.6l instad of a 2.3l. I hope this will take care of the problem. pulling the motor was a easy job being my first one ever!!! But It was not hard. Having the time and another car to drive is a must though!!!! expect your car to beatleast a month undrivable. If youneed help fixing or other comments on a 1986 isuzu trooper E-mail me @ nunesjeff@yahoo.com Good luck Troopers!!!!! Jeff Nunes Lebanon Oregon