T180 random smoke issues

[Iitommoii]

2007 rav4 t180 110k miles.

I get alot I mean alot of white/blue smoke after being stuck in traffic.

I have been out on 200+ mile run and nothing at all. But as soon as I hit traffic the smoke starts for about a minute or 2 then clears.

It runs perfect no oil or water lose and seems very random about how many times it happens. Some weeks I can happen every day on my 20mile trip to and from work. Other times it can go for weeks without a puff.

I have started using some fuel additive and it seams a bit better but as soon as I fill up on cheep fuel the smoke starts again at random.

Any ideas or common faults/fixes for this? 

Thanks 

[FROSTYBALLS]

Moved to the Rav4 club.

[velles2003]