2006 Highlander bought on OfferUp two years ago 120K miles .. no maint records… Everything looked great. Runs like a top. We've done Oil changes every 5K w 5W/30 syn blend. Last oil change 160K noticed oil leak though front valve cover. Took it off and found this cake/sludge. Cleaned the cover...air/oil chamber best we could. Didn't touch the sludge. Replaced the oil pressure sensor, pvc valve.
Ran transmission fluid/Seafoam. Put in new oil/filter ... oil light comes on at higher RPMs and goes off when reduced.
Dropped the oil pan & cleaned the intake screen .. still getting sludge/carbon in the filter. Oil light comes on at higher RPM's.
I want to take the valve cover off the front bank again & physically remove some sludge/cake and then run the BG Dynamic Cleaner/Rinse.
I'm not taking off the plenum to get to the back bank ... any other suggestions?
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