My thoughts on engine oil, read the specs carefully. If the specs on the container meet the requirements of the engine manufacturer, I would have to assume it's good to go. For a company to falsify that information would be disastrous for them in court, especially an established name like NAPA. They would have big bucks to loose along with their reputation.
Transmission fluid, the differences in the different specs are more about the effect of the additives as far as clutch friction vs. anti wear. Each transmission design balances the clutch slip rate when applying, holding ability, temperature, anti foaming, and who knows what else as far as component compatibility! A lot more to it than just viscosity. Again, a company would be really putting themselves on the line to sell something of questionable compatibility. My guess is some of the different fluids are so close they will work, so to reduce shelf space, they combine applications.
Synthetic gear oil, I love it! That's all I use in industrial gear boxes, especially the ones that tend to run hot. It makes the seals last indefinitely. Combine that with the variable temperature stability of automotive applications, it's a win-win combination!
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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