yes, the R380's are similar, but the D2 box has improved bearings and shafts.
A syn ATF will shift better when cold than any MTF, but with that VI (VI=209) it obviously has a healthy dose of VII's (viscosity index improver's) and no matter how shear stable they may be these days, it will shear (get thinner) with use.
A dedicated syn GL4 spec MTF should also protect the gears and bearings better than any ATF, even those that are very high quality (Redline, Amsoil, Neo, Castrol Transmax Z and I'm assuming Penrite synthetic ATF), but my understanding is that Penrite 75 isn't as robust as their ATF.
Penrite also make a synthetic MTF, 'SIN Manual Trans' which looks good on paper, and could be equal to or better than Syntrans in use.



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