Unfortunately, a rich mixture doesn't produce oil though, just a dry black carbon fouling and it would be on all cylinders, not just two of them. You can clean and lean, but if the plugs come out oily again either your valve seals are leaking or the oil control rings are bad on those two cylinders. I made a Youtube video on replacing the valve stem seals. If you see smoke when taking off from a stoplight, it is probably the rings though. Compression and leak down tests can still show that the cylinders have good compression too if just the oil rings are bad, but it wouldn't hurt to do a compression test. It's an easy and low cost engine to rebuild though.
Last edited by sactojohn; 01-08-2017 at 04:20 PM.