Disregard any thing writen by amsoil they make a good product but the stuides are way slanted.
Belray is a good product and will serve you well.
The Spectro Platium is about the best for six speeds but hard to find.
Redline, roal purple all the 100% true sny GEAR lubes will do fine in the tranmission.
Avoid SNY in the primary.
M1 VTWIn 20/50 is a fine engine oil you will find others as good but not anything much better.
Besides with all this rain and flooding the bel-ray that traces it roots back to boat engines might be a good idea
You have some good stuff it just ride
Karl Marx said, "Destroy their culture, rewrite their history. Ruin their art and literature, and defame their heroes, by offering fabrications to scandalize that which they considered good.