Primary Oil
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Ultimate HDF Member
Joined: Feb 2010
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From: Jayhawk Country
Primary Oil
I'm getting ready to do my 1k mile service on my 10 EGC. I was going to use M1 20w50 in the motor, Redline in the tranny but I'm still unsure on the primary. I was thinking I would just do the M1 20w50 in the primary also but heard a few people were doing Auto transmission fluid. Whats best? I already have the M1 purchased so that would be easiest. Any downsides to using the M1 20w50 in the primary?
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Road Warrior
Joined: Jun 2007
Posts: 1,788
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From: Here
Many opinions on this, almost as many as on engine oil. Here's my experience -
Used 20-50 for a while and had tons of clunk and didn't really like the feel of the clutch.
Switched to Formula+ and was much better.
Since I can't leave anything alone (and after reading about it here), I then switched to Type-F (pick the brand you like) and am really happy with it thus far. I decided on it over the Dex III due to no friction modifiers in the Type-F, and seeing Type-F recommended by a few different clutch disc manufacturers. No slipping and good feel in slow speed maneuvers. With a good clutch adjustment, I don't get any first gear clunk despite what others say. B&M Trick Shift has been mentioned as well, and the bottle says it is suitable for a transmission that specifies Type-F. Valvoline was 1/2 price of B&M so I used the "less is more" philosophy on it.
I think, like many others, that M1 (or any other high tech synthetic) is probably overkill in the primary. The main function of the oil in there is cooling the clutch pack and providing a little lube to the chain and bearing. So a high tech oil isn't necessary, but does make it simpler just to dump in the same oil as the engine and be done with it I guess.
Used 20-50 for a while and had tons of clunk and didn't really like the feel of the clutch.
Switched to Formula+ and was much better.
Since I can't leave anything alone (and after reading about it here), I then switched to Type-F (pick the brand you like) and am really happy with it thus far. I decided on it over the Dex III due to no friction modifiers in the Type-F, and seeing Type-F recommended by a few different clutch disc manufacturers. No slipping and good feel in slow speed maneuvers. With a good clutch adjustment, I don't get any first gear clunk despite what others say. B&M Trick Shift has been mentioned as well, and the bottle says it is suitable for a transmission that specifies Type-F. Valvoline was 1/2 price of B&M so I used the "less is more" philosophy on it.
I think, like many others, that M1 (or any other high tech synthetic) is probably overkill in the primary. The main function of the oil in there is cooling the clutch pack and providing a little lube to the chain and bearing. So a high tech oil isn't necessary, but does make it simpler just to dump in the same oil as the engine and be done with it I guess.
Last edited by 07RoadHawg; Jul 13, 2010 at 02:27 PM.
Road Captain
Joined: Mar 2008
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From: Cincinnati Ohio
I've heard of guys running conventional motor oil, automotive motor oil, and doing fine in the primary for 10k. Probably works just fine. I have syn 3 in mine, all 3 holes, and it's fine, but overkill on the $. Gonna try ATF or conventional oil, gonna do more research though.
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Seasoned HDF Member
Joined: Aug 2009
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From: west Michigan
Here's what I found when I decided to use Mobil 1 in my RK.
http://www.mobiloil.com/USA-English/...T_Primary.aspx
http://www.mobiloil.com/USA-English/...T_Primary.aspx
Road Master
Joined: Nov 2009
Posts: 997
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From: Charlotte, N.C.
I use Big Twin primary oil its better than the 20w-50 amsoil, Formula 1, and syn 3. IMO, its seems to coat the chain and gears better and the clutch application is nice and smooth and the whole operation is much quieter. Thinking about using B&M quick shift that stuff works great in my racecar.