More stable than an ATF. ATf is jsut a compromise which allows them fill them on the line with 1 station. I believe the older Jeep T-case used to allow motor oil to be used.
My FWD NV A520 A555 transaxles etc were factory filled in 86-88 with ATF, Chrysler only used the ATF because it would allow better shifting but sheared faster. They switched to the 5w-30 motor oil from89 and up to protect the gear set and differential better. this is from the head chrysler reliability engineer I know.
Per the T-case, I like the MTF better than the ATF. As I said the guy at TCU on the Jeep boards who has rebuilt 100's of the SElect and command Trac T-cases says the best thing you can do is run the synthetci motor oil in them versus the ATF.
The MTF has the same viscosity as a 5w-30 oil but is even more sheer stable with better additives, hence my choice.
Originally Posted By: deeter16317
Originally Posted By: VNTS
I use Amsoil MTF in my NV242 cases.
On the Jeep boards there is a guy rebuilds most of the Jeep Transfer (Transfer Cases Unlimited)cases and recommends synthetic 5w-30 oil for his warranty since the oil will not shear like the ATF. I have used the MTF for a couple years, prior to that I used the Amsoil ATF. I drain em every couple years since it is so easy.
Motor oils are typically not as shear stable as a gear oil/fluid. I assume your talking about 5w30-weight MTF?
Using the MTF is similar to the use of SynchroMax...they are both manual transmission fluids.
My FWD NV A520 A555 transaxles etc were factory filled in 86-88 with ATF, Chrysler only used the ATF because it would allow better shifting but sheared faster. They switched to the 5w-30 motor oil from89 and up to protect the gear set and differential better. this is from the head chrysler reliability engineer I know.
Per the T-case, I like the MTF better than the ATF. As I said the guy at TCU on the Jeep boards who has rebuilt 100's of the SElect and command Trac T-cases says the best thing you can do is run the synthetci motor oil in them versus the ATF.
The MTF has the same viscosity as a 5w-30 oil but is even more sheer stable with better additives, hence my choice.
Originally Posted By: deeter16317
Originally Posted By: VNTS
I use Amsoil MTF in my NV242 cases.
On the Jeep boards there is a guy rebuilds most of the Jeep Transfer (Transfer Cases Unlimited)cases and recommends synthetic 5w-30 oil for his warranty since the oil will not shear like the ATF. I have used the MTF for a couple years, prior to that I used the Amsoil ATF. I drain em every couple years since it is so easy.
Motor oils are typically not as shear stable as a gear oil/fluid. I assume your talking about 5w30-weight MTF?
Using the MTF is similar to the use of SynchroMax...they are both manual transmission fluids.
Last edited:
