Engineers get paid to change the product. Reasons behind the engineering changes can address: warranty issues, incidents on test, ease of assembly or manufacturability, cost reduction, power/torque increases, corner conditions (those conditions where a product is used in a unique fashion), abuse (using software), government mandated safety or emissions requirements, new or different applications, supplier change, etc. It can be a challenge to look at two tractors from the same family, but different model years, and understand the reasons why the design has evolved.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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