
Originally Posted by
ek2jayvee
Let me answer this sir.
Technically no need because it is the soot passing through the EGR valve that causes the heavy carbon deposits a intake manifold and EGR that requires regular maintenance.
However, there will be some thin layers of sludge that will accumulate in the walls of the intake manifold. This sludge is a combination of the oil vapor from the crankcase that could still somehow pass even if we have OCCs installed and the small dust particles that get through the air filter. Pero this will probably have no sig ificant effect on performance.
Maintenance/cleaning CAN be scheduled together with the change of the timing belt, so every 100k, rather than 40k.
If you also blank the connection between the EGR valve and the manifold, your EGR stays clean.