Hey guys, new here. I got my supra mk3 fully rebuilt. Put about $7/8k into it. My son was driving it, fouling spark plugs with oil at the beginning (normal, sealing process right) but after 2000/5000 miles, still running but smoking excesively, all the time. New turbo, Compression is good across, What do you guys think, oil seals, valve stem seals? Any ideas. Don't want to take apart