I have a long haul trucker friend who is quite knowlegable mechanicaly but he made what seemed a very strange reply when I asked him what he used for his diesel fuel conditioner. I was fishing for advise for my Duramax.

His reply was that he puts a pound of lard in the fuel with each fill in the summer and uses canola oil in the cold weather. Says the diesel just dissolves the lard and it's the cheapest fuel conditioner you can get.

His truck is a late model with the Cat engine and pulls a 'B' train.
The truck has over 200,000 miles on it and the injectors/ pump have never been touched.

He is a good friend and I'm sure he is telling the truth; but this really seems strange.
Anyone ever heard of such a thing??

CHRISTO.