montero smokes after being in idle?

[general0]

I was wondering if anyone knows what causes my 3.5 v6 motor to blow smoke from the tail pipe after it has been running idle for a few minutes? I was waiting for my wife to come out of a store and it had to have been a good 15 minutes and when it was time to leave the engine blew smoke from the tailpipe (white/blue in color). I stopped to see what it was and it's oil for sure ( not a sweat smell). After a minute or so it stopped but I'm worried it's a sign of bigger problems. I had the motor completely rebuilt 15000 miles ago at the cost of 5500.00 dollars and don't want to spend that kind of money again!!!
Please Help!!

[foto]

I had a similar experience a couple of years ago, while sitting in line to see the Miramar air show (I should have known better) once youre in line, theres pretty much no place to turn out. I idled (and slowly creeped
along) for about 40 minutes. As the weeks passed, the Montero would blow blue smoke after every stop sign or light, not while "driving along", but after every stop. Turns out I needed new valve seals, to the tune of about $350.00.....not too bad for that kind of job. I do work in the Automotive field, and was able to have a friend/mechanic do it for me. It's run absolutely perfect ever since! I have a 94 with a 3.0 in it, and the odometer is 700 miles from turning over to 200,000! It doesnt drip a bit of oil. Ive had really good luck with it so far--I just make sure I have it regularly serviced.

[blupajero]

I agree with foto. Worn valve stem oil seals cause this problem. Try using original seals on your engine. Bet your mechanic used aftermarket seals. Should have lasted more than 15000 miles.