M5 fluid.

[heptofite]

Trying to find a new fluid for my M5 in my '00

Merc V is like tap water and i have to double clutch third all the time and it's getting irritating.

Was thinking of Pennzoil Syncromesh or Redline MTL.

anybody used either of those?

 

[country0001]

I think amsoil makes something for it.

 

[adsm08]

The clearances in the M5OD are pretty tight. Putting fluid that is much thicker than Merc V in it will cause more shifting issues than it will help.

3rd gear may just have a bad syncro. I know my dad absolutely killed the number 3 syncro in my old transmission. Try putting it in 4th before 3rd, it can help line up the teeth.

 

[greenpus]

Trying to find a new fluid for my M5 in my '00

Merc V is like tap water and i have to double clutch third all the time and it's getting irritating.

Was thinking of Pennzoil Syncromesh or Redline MTL.

anybody used either of those?

I use Redline ATF-D4 in my 2000 and I like it.
I tried using Redline MTL and it works great in the summer but when temps drop in the 50's, it's a bitch to shift until the tranny warms up which may take a while. I also ran a mixture of 1 qt MTL and 2 qts of D4 and that worked as well

 

[ElleShooTiger]

I recently switched to the SuperTech Mercon from Wal-Mart from Castrol Mercon, and I kid you not it shifts like butter now! First and second were hard to shift in before, but now the trans shifts so much smoother

 

[rusty70f100]

I switched mine to Redline MTL, but that was only to quiet gear noise and get me by until I can rebuild it. What is said above is correct, shifting can be difficult when it's cold out, particularly below freezing. When it warms up after a few miles it's fine though. When it's warm shifting is much improved over anything else I tried in it.

I'd recommend Redline D4 if yours is not making any excessive noise and you live in a cold climate.

 

[racsan]

i have ran pennzoil sycromesh with no bad effects. but if you already have a issue, a different oil will unlikely make things better. my transmission goes up through the gears fine, but doesnt like to be downshifted into 2nd gear. i found though if when i go to downshift if i tap the gas pedal while the clutch is pressed in as im about to down shift, it goes right in. dont know if its a syncro issue, but my method works.

 

[BlackBII]

You're double clutching to get into third...so you are having problems downshifting then?
What RPM are you trying to get into third at?

Don't run anything thicker than ATF.