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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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