I keep hearing that blocking the EGR will help keep my oil clean. For example, I copied the following quote from a dissertation on NADS:


Blocking hte EGR not only helps to keep your inlet manifold and oil clean

From my understanding, the EGR just adds exhaust gases into the inlet in an attempt to keep emissions lower. Anything in the exhaust gases would have been through the engine once and burned (lar4gely anyway) and will now be circulated through the engine again and out the exhaust.

How does stopping that happening keep my oil cleaner?

This may be a stupid question, but it is seriously meant - I just don't know, so be gentle with your replies.