A friend has a GN that has had the motor recently rebuilt. Rebuilt heads, all new lifters,springs,valves,cam,pushrods,and crank. Reused the stock pistons and rings. The car runs beautiful except for a smoking problem about 30 seconds after startup. Car smokes unless it is under a load. Blue smoke. Checked the turbo and it is fine. New PCV and EGR. No oil in intercooler. I am thinking leaky intake gasket or rings. But why no smoke under a load? Will a compression test find a sticking oil control ring? He is ready to trade his car for a mustang!!!Please help!:biggrin: