Thanks for the imput.I like the little engine and was looking for the little tricks that may be lurking around that might help it.I have seen some take out engines at the freightliner shops but those seem to have been the twin turbo units in the 08 model range.Mine has the 04 emissions.I had thought about blocking off the EGR from the exhaust side to reduce the thermal load on the cooling system. since there seems to be no sensors on the system itself , maybe no SES light would be set. The exhaust is very clean on this truck with very little soot out of the stack.The engine temp does seem to fluctuate quite a bit . from 170 to 210, maybe some different stats to help keep temps at a more steady state around 180 ? What are some of the Euro sites that discuss these engines?I see alot of these engines in the M2s ,Spotchassis and RV haulers, it would seem more people would be tinkering with them?