Originally Posted by hey_allen

Ok, what would you all consider to be excessive blow by?

My SD puffs like the mentioned steam locomotive, through either the vent hole, or even through the much larger oil fill cap, if it's open.
It now has enough pressure that it blows oil out under the valve cover gasket, and even out around the dipstick, lately!

I really need to find another MB diesel owner to compare notes with, and let look at this. I've worked on other cars for a good while, but I still don't know what is normal, tolerable, or "fix it now!" on the MB's. Some things that I just don't pick up from reading commentary here in the forums.