Thats funny, because youre the second person in the last week that I have talked to that has told me about problems with CATs. His was with the computer, said the engine would not run right until they warmed it up with a hair dryer in the winter. If you read my profile, you see I am a heavy mechanic, so I definitely will work on my own motors. I have a D60 in my Freightshaker, and it just keeps on runnen!, So now you have got me all perplexed, I guess I will have to give the Detriot and the Cummins some more thought!