Hi,

I am intending to use Redline MT-90 for my Gearbox Oil while will be using the Redline 75W90 for the transfer box and rear differential. Climate is hot here btw. So, I heard RUMOURS that the MT-90 is not good for synchro boxes. Is this true? If not, do I have any problems with using these products?!

Many Thanks for your assistance!

 

MT90 is designed specifically for synchro gearboxes. Not sure who would have told you otherwise.

 

Would I be fine with Redline 75W90 for transfer case and rear diff?

 

Yes, a 75w90 GL5 rated oil is fine for those.