jamesNB,

Some of your post may have merit but changing the fuel filters when there is no power loss is ridiciulous.

The reason diesels smoke is because the mixture is too rich. Gasoline engines will also give off black smoke if the mixture is too rich. Ever have a stuck choke or bad carburator?

Ever see a tractor pull where the Diesel tractors pour out volumeinous amounts of black smoke? That's because the IPs are adjusted for a very rich mixture and maximum power.

P E H

P E H