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Had to make a precautionary landing (at an airport) due to falling oil pressure. Lost 3 quarts in one hour, oil pressure fell into the yellow but not below about 40 psi, 4 quarts left in the sump, still above Lycoming minimum of 2. No external sign of oil loss, but plugs on #4 were fouled with oil. Replaced the cylinder, found the old oil control ring was sticking in its groove, apparently due to varnish build-up. Also noted scuffing around the piston crown, some old spots, some newer and still shiny. Cerminil bore appears undamaged. Do I trust the remaining cylinders, or do I do a preemptive top overhaul? 900 TSMOH