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Royal Purple Synchromax...
Well, I decided to give RP Synchromax a second try to see if I just had a strange occurrence in my NV5600 a few years ago...I wanted to try it because I can get it locally.
Well, it lasted significantly longer this time around...but its still far from a spectacular performer at 8k miles and needing changed. And it seems to happens all at once...one day its shifting fine and the next its very stiff.
Operating temperatures never change, so that's telling me its still protecting, but the additives that make the shifting perform well are breaking down.
I did get it hot when traveling to TX last week, but that was from the outside temps being hot (over 100*F). My trans runs a little more than a proportionate linear trend...at 70*F, its 140*F; at 100*F its pushing 205*F...which is still 30*F cooler than it did before the Fast Coolers were installed. I'm wondering if increased temps during this run caused the shifting to deteriorate (the shifting performance additives to fail)?
So, I'm changing back to Redline MTL which seems to be the only Synchromesh-type oil of the main three (Amsoil, Redline, and RP) that lasts in my trans. I will add that I have over 100k on RP Synchromax in my tcase with excellent results.
steved
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Linear Mode
