Bonneville America Forums Forums Off Topic Discussion Forums Lounge VW revisited

That DEF is a huge PITA and can be deleted. Have to stop and regenerate the system or the truck goes into limp mode causing all kinds of problems requiring dealer reset. I run our oldest truck with no DEF system and that truck can run circles around the others and runs more efficiently using less fuel per mile. To regenerate you have to leave the truck run at high idle until the process has finished then you have to rev the engine at a high RPM to blow the ash out or it hardens and clogs the exhaust, so environmentally sound, must be much less pollution letting those trucks idle for extended periods then revving to blow the ash out.