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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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