I have a 94 land cruiser that has burned a small amount of oil for a long time. More significantly were numerous oil leaks that was making a real mess on the ground and under the engine. Eventually I had the valve cover gaskets and seals, front seal, oil pan top and bottom seals replaced, timing seal, all o rings and seals, thermostat and seals, timing chain, front seal etc... replaced as well. Shortly after doing so it started to release smoke when accelerating after a coming to a complete stop after driving over 60 mph. A really significant plume of smoke (very large cloud) and some engine clatter and stumbling occurs as it happens. Noise and smoke stops quickly then accelerates and drives with no issues until the next time that I exceed 60 mph. It never blows smoke no matter how much I drive as long as I'm below 60 mph. I do have to add oil regularly, so there is oil being consumed. There is no issue with vehicle temperature, radiator fluid level, or leaking. If I never had to stop, I would never know there was any problem at all as it accelerates and runs great. I asked a Toyota technician and he thought it might be valve stem seals and the fact that when stopping the vacuum is high and might be sucking oil into the valves? Another person said it might be bad rings and bad valve seals. The vehicle has 325K miles on it and I plan to keep it forever. I have been told that a valve job could cost $4,000 and if rings need to be replaced thus rebuilding the engine could cost an additional $6,000. Not sire if these costs are reasonable, or what all I should be making sure is done/replaced with the rebuild. I shy away from replacing the engine with some other high mileage engine, thus I would appreciate comments on whether this problem is one that you have experienced, does the possible cause make sense, and are these estimated costs reasonable.
Thank You!
Thank You!