I am having seepage through my valve cover gaskets and cam caps. I have been running M1 since shortly after purchasing my 4-Runner. The vehicle was purchased at 56,000 miles and I assume dino was run. I did quick oil changes with dino to clean internals when I purchased vehicle. I then started running synthetics M1 at about 65,000 miles. No leakage at all until M1. I understand that M1 is cleaning residue and is exposing areas that were coated with dino on the seals. Shouldn't the conditioners in M1 condition the seals and eventually stop the leaks? Is M1 lacking this? I am at a loss as to what should be done. Would switching oils do the trick, Amsoil, Redline, GC.? I would hate to go back with dino. I could replace the gaskets but I will have to pull intake manifold! Any suggestions? Thanks Daily Drives -2003 Toyota Tacoma PreRunner XtraCab, Impulse Red, Peppy 2.7 Liter 4 Banger, Running Mobil1 Synthetics SS 5W-30. ODO 5400 Miles. -1995 Toyota 4-Runner, Evergreen, 3.0 V6, Running Mobil1 Synthetic SS 10W-30. ODO 82500 Miles.