This has become an adventure. Looking for gear oils that might solve the problem, reading that the GL-5 oil has sulfur in it, that could corrode yellow metals, so could shorten the life of syncronizers, If they are brass. Oils like symthetics might be TOO slippery to make the syncros do what they should, and grab and match gear speeds. Subaru says an oil that some say solves the problems I have/had isn't recomended, and they claim No problems with trans durability.
I came across "Cold Welding", where if the oil doesn't stay on/ between the gears, they can stick because of microscopic irregularaties, which sounded like could be the problem getting out of
1st. The sulfur additive in oils, recomended for Rears forms acids when temps get above 250deg, which will corrode the yellows. Who says a trans Won't get that hot, and others say that they can Between the teeth, from the friction, and hot enough to destroy oils if towing. I found out about the test for corrison of yellow metals, where they use a copper strip, and a better one using silver. I look up how hot a tranny can get, and 300deg isn't unheard of, especially when towing. Auto trans's cool it with the radiator, and How Hot is the coolant, 250deg?? So what is auto trans fluid get up to? Auto trans people say 300deg, and cool it down to 240-270deg. 175deg is said to be the best temp for auto trans longevity, so don't know how that would be had, without an oil cooler. I never worried about auto trans fluid, as long as it looked good, but the info is making me think about both auto and manual trans oils.I am planning an around the country trip towing some kind of trailer, with some kind of vehicle. I think it Behoves me to learn all I can, and even for every day driving of a new and old car. 20yr old one only has 80K on it. I'd like to know what temps the trans oils get up to, and if the manual trans oil becomes acidic. They Say you should check the ph of coolant, with all the aluminum and plastic in modern cooling systems, since acids can corrode aluminum, and make plastics brittle, and cause failures.
Should get some Interesting replies...
VF