Well we've got another one. It's a 4G54 but it usually doesn't make a difference what model engine it is. Same exact problem no smoke when working the truck, only smokes after idling. I checked the internet and it seems that Mitsubishi car engines have had the same issue. Some say that the OEM valve seals are crappy and they change them to high performance racing ones. Other sites say to use only 15W40 oil in these engines. I can't be the only one with this issue.
Any thoughts?......