Re: Seafoam yay or nay?
Diesels don't produce vacuum, that's why they have a vacuum pump. On a turbocharged diesel, absent any emissions devices, the pressure in the manifold is always equal to or higher than atmospheric. If you put seafoam in the vacuum line, it'll end up in the vacuum pump and ultimately the crankcase, possibly damaging the pump in the process.
Best way to clean EGR soot is to remove the intake and the EGR diffuser in the intake and clean with a solvent. However, this shouldn't be necessary unless there are symptoms of a restriction.
2015 WK2 EcoDiesel Overland 4x4 Billet Silver, ORAII, ATG
1990 Mercedes-Benz 300D 2.5 Turbo - 155k
No sparks allowed!