Quote:
Originally Posted by Mxfrank
If you let it go, it can get bad, I suppose. But cleaning out a manifold every 150K miles isn't so awful. Shouldn't affect performance much, either way
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I've cleaned out the intake on 3 diesels (OM603T, OM606na OM602T) so far and the performance improvement was dramatic as well is the reduction in smoke at high load. A dirty intake will increase your hydrocarbon pollution (smoke) under load. These engines were designed without EGR then it was tacked on as an afterthought to get it to meet an arbitrary NOx limit set by CARB and the EPA.