m5od fluid

[Bray D]

I called Ford and they said this tranny can use both ATF and gear oil. does one have an advantage over the other? I hear good things about GM Synchromesh but its damn expensive.

 

[metalmacguyver]

Your ford guy screwed up. People have put gear oil in M5ODs before with bad results. They take ATF. Some say that 0w30 oil also works. I have not tried it.

Gear oil is too thick. The idea behind the 0w30 is that it is the same viscosity of atf.

 

[Bray D]

awesome, that just saved me a lot of money haha. I drained it and it was super dark but still had the red tint to it. looks like it was a good time to change it.

 

[4x4junkie]

Yep, Mercon ATF (be sure to use actual Mercon-spec fluid, not Mercon V, otherwise the shift quality will degrade. It's not completely compatible, despite the stupid games Ford has been playing with these fluids recently)

 

[racsan]

ive been running the pennzoil syncromesh fluid for almost a year now. its no worse money-wise than mobil-1 synthetic atf. its worked well for me. never ever run a gear oil in it though. its almost as bad as running nothing at all in the transmission. the final result will be the same, you'll need another transmission.

 

[Hardwareman]

I'm running 5-20w Pennzoil motor oil with a half quart of Lucas in mine and have'nt had any problems with it. It does'nt leak a drop and shifts pretty smooth as well.




Allen

 

[Quiksurf]

mazda guys used to put 1/2 atf and 1/2 80w90 for years i have seen it, ford guys seem to use 80w90

 

[4x4RangerGuy]

That's scary that the person you talked to at your Ford dealership said the M5R1 could take gear oil. Just wow.

Mercon ATF is the proper oil for the M5OD. I had to run Mercon V for a little bit in a pinch, and I didn't notice any differenced in shift quality. However, many people have noticed degraded performance with Mercon V. I suppose it depends on how new the transmission is.

Mercon/Dexron III is still available and always will be. It's just labeled differently due to Ford's ownership of the Mercon label.

 

[Jason_12_02]

Mercon/Dexron III is still available and always will be. It's just labeled differently due to Ford's ownership of the Mercon label.

Yeah, its now Dex/Merc. Same stuff; different name. You would not believe the trouble this name change has caused counter guys like myself. I have to prove it at least twice a week to a customer that it hasn't changed.