Oil Grade
Road Warrior
Joined: Dec 2008
Posts: 1,476
Likes: 23
From: Summit, Mississippi
All across any HD forum you will find people as passionate about this as they are what oil they run in the motor. I say...work what works for you, but will a make a couple of comments.
I do think that the MOCO no longer recommends the use of Syn 3, or any other motor oil in the transmission and they must have a reason. They now use a Formula + in both the primary and the transmission.
I look at it this way. The engine itself has a few gears, but most moving parts in there slide on some surface or ride on bearings. The primary is not unlike an automatic transmission having chains and clutches...no gear engagement. Lots of guys run ATF in there or just about any grade of light oil that does not have friction inhibitors. The transmission is full of gears and other stuff that bangs around back-n-forth under some pretty severe stress and it demands another kind of lubricant that can stand this sort of stress. I simply ask, would you put motor oil in the 5-speed gear box in your Porsche or favorite pick-up truck. I think the answer would be no way.
I do think that the MOCO no longer recommends the use of Syn 3, or any other motor oil in the transmission and they must have a reason. They now use a Formula + in both the primary and the transmission.
I look at it this way. The engine itself has a few gears, but most moving parts in there slide on some surface or ride on bearings. The primary is not unlike an automatic transmission having chains and clutches...no gear engagement. Lots of guys run ATF in there or just about any grade of light oil that does not have friction inhibitors. The transmission is full of gears and other stuff that bangs around back-n-forth under some pretty severe stress and it demands another kind of lubricant that can stand this sort of stress. I simply ask, would you put motor oil in the 5-speed gear box in your Porsche or favorite pick-up truck. I think the answer would be no way.
Elite HDF Member
Joined: Apr 2006
Posts: 3,948
Likes: 54
From: The Burgh
All across any HD forum you will find people as passionate about this as they are what oil they run in the motor. I say...work what works for you, but will a make a couple of comments.
I do think that the MOCO no longer recommends the use of Syn 3, or any other motor oil in the transmission and they must have a reason. They now use a Formula + in both the primary and the transmission.
I look at it this way. The engine itself has a few gears, but most moving parts in there slide on some surface or ride on bearings. The primary is not unlike an automatic transmission having chains and clutches...no gear engagement. Lots of guys run ATF in there or just about any grade of light oil that does not have friction inhibitors. The transmission is full of gears and other stuff that bangs around back-n-forth under some pretty severe stress and it demands another kind of lubricant that can stand this sort of stress. I simply ask, would you put motor oil in the 5-speed gear box in your Porsche or favorite pick-up truck. I think the answer would be no way.
I do think that the MOCO no longer recommends the use of Syn 3, or any other motor oil in the transmission and they must have a reason. They now use a Formula + in both the primary and the transmission.
I look at it this way. The engine itself has a few gears, but most moving parts in there slide on some surface or ride on bearings. The primary is not unlike an automatic transmission having chains and clutches...no gear engagement. Lots of guys run ATF in there or just about any grade of light oil that does not have friction inhibitors. The transmission is full of gears and other stuff that bangs around back-n-forth under some pretty severe stress and it demands another kind of lubricant that can stand this sort of stress. I simply ask, would you put motor oil in the 5-speed gear box in your Porsche or favorite pick-up truck. I think the answer would be no way.
Thread
Thread Starter
Forum
Replies
Last Post
Rowdy25
Oil Archive (no new posts)
14
Sep 16, 2022 02:39 PM
