[DK on the road]

All diesels have some blow by. Do not try and control blow by, other than redirecting it. I have a Holiday rambler with a 3126 cat. ( I need to sell) that is a rear radiator model. I've taken that motorhome on plenty of dirt roads and its caused a lot of problems because of the pour design. The blow by pipe exits a mist of oil, some times a droplet or 2 down towards the ground and the rear facing fan picks this oil and dust and places it firmly into the shroud area into the intercooler, transmission cooler, then radiator. This is a PITA to clean.

Here's how i fixed my problem. I placed an extension on the blow by tube at a gentle angle to the rear, just past the large mudflap I have built across the whole back directly under the radiator. This created a higher pressure in front of the radiator and low behind it. I then lowered the blow by tube to about 4" off the ground on the back of the mud flap. I still get a light mist on my trailer or truck when towed, but its...controlled (?) somewhat. I have thought about placing a collector of some sort under this, but the risk of clogging or plugging isn't worth the probable valve cover gasket leaks or worse that I will get.

I need to get out and do the same, or similar, for the C15 in the Newell.