I have worked on trucks for almost 40 years;just today we were talking about how the ceiling in the shop years ago was perpetually black from exhaust soot. Nowadays it stays relatively white. Exhaust emissions are so much less:we used to start a truck and have to open the doors to see/breathe. The engines stay cleaner and hardly leak any oil;fuel crossover lines between tanks under the truck are gone,to prevent spillage from catching and rupturing.Engines don't burn oil anymore(if they did the dpf filters would clog).All this is due to epa laws. I believe manufacturers would try to prove to the epa the emissions equipment was unnecessary if it truely was unneeded.It costs more to design and make,but it has cleaned up the air and roads. Also, retreads are better than they used to be;casings are better inspected, better methods: a lot less peeled recaps. I believe coal powered plants use similar technology to reduce their emissions as diesels,injecting a catalyst to react with nitrous oxides which makes nitrogen and water from the exhaust. It s a cleaner but more complicated and expensive world.Mark
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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