M5OD lube question
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Mountain Pass
Joined: Dec 2006
Posts: 249
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From: Osburn, ID
M5OD lube question
I've read many posts on the best lube for this trans but have a few questions. I had it rebuilt and the rebuilder recommended 10/40 engine oil stating it would lubricate better than atf. I used it but it was very notchy and difficult to shift in the morning with temps around 35 F. I drained it to get rid of the initial break-in material and put dex3-mercon in. It shifts better in the am but is still notchy. Trans otherwise is fine without any unusual noises.
Before wasting money on other fluids what's the consensus on pennzoil or valvoline synchromesh or redline mtl? Thanks
Before wasting money on other fluids what's the consensus on pennzoil or valvoline synchromesh or redline mtl? Thanks
Elder User
Joined: Dec 2013
Posts: 655
Likes: 0
From: Kansas City, KS
I put Napa Dexron-Mercon 3 in my '96 M5OD. I couldn't tell what kind of fluid was in it before, since I've only owned it two years. I will say that new fluid made a significant difference in shifting. It feels slicker for sure.
I've heard Redline is the best. FTE member SideWinder4.9l said in one thread that the syncromesh is the best, if you're willing to spend the money. I can't back that up, myself, and I'm hesitant to use anything other than what's recommended.
We'll see what others say when they chime in.
Paul
I've heard Redline is the best. FTE member SideWinder4.9l said in one thread that the syncromesh is the best, if you're willing to spend the money. I can't back that up, myself, and I'm hesitant to use anything other than what's recommended.
We'll see what others say when they chime in.
Paul
Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 76
From: Gilbert, PA
I've read many posts on the best lube for this trans but have a few questions. I had it rebuilt and the rebuilder recommended 10/40 engine oil stating it would lubricate better than atf. I used it but it was very notchy and difficult to shift in the morning with temps around 35 F. I drained it to get rid of the initial break-in material and put dex3-mercon in. It shifts better in the am but is still notchy. Trans otherwise is fine without any unusual noises.
Before wasting money on other fluids what's the consensus on pennzoil or valvoline synchromesh or redline mtl? Thanks
Before wasting money on other fluids what's the consensus on pennzoil or valvoline synchromesh or redline mtl? Thanks
Elder User
Joined: Dec 2013
Posts: 655
Likes: 0
From: Kansas City, KS
I would put the 10w40 back in and go to the trans guy. Have him drive and say WTF. Either YOUR rebuild is bad OR it has the wrong fluid in it(leave out how you put ATF in it) and see what he says. If he says ATF, put ATF in it and tell him his rebuild is bad and you want your money back. They are NOT notchy transmissions. he must have done something wrong, you do NOT need snake oils is a FRESHLY rebuilt trans
Good luck and post back when you have more information.
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