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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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