I'm not going to go through this again. It was discussed ad nausium during the "everlasting thread".
Yes, the cut of the gear makes a difference on how much pressure the gear teeth are subjected to. The most severe is hypoid gears, which the MTX75 doesn't have.
But as I said before, using the correct EP (extreme pressure) additives does not harm the lubricant and provides better protection.
Differential gear oil is seldom appropriate for manual transmissions. It is the overall characteristics of the fluid that must be kept in balance.
If a vendor can provide a full synthetic that has the characteristics you described plus they can build in better gear load protection and improved friction modification in a package that is intended for manual transmission use and costs less than Ford Honey, why not use it?
So tell me, what full synthetic heavy duty diesel engine oil is priced at $20.00 a quart? If it is so critical to use Ford Honey, why doesn't Ford allow others to supply it? Also, why was ordinary ATF considered OK for several years?
I started this thread to show that there is another alternative. Still other alternatives include Torco and Specialty Formulations, and I actually feel that either of these would be an improvement over Ford Honey.
This will be my last post on this thread.
