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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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