MULESKINNER
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What about just using a plain non detergent 30 weight oil in the primary? It should be light enough of a weight oil and should do for a lubricant?
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Well I look at it this way - it's a double-row chain and two double-row gears. Oh, and a clutch basket. You can probably run just about anything in there as long as it doesn't have a huge amount of moly.
Personally, I use the Rotella 15W-40 and change it every 5,000 miles.
There's a virgin oil analysis somewhere on this board for HD Formula+. I believe it specs out as a GL-3 lubricant.
The only other thing would be to make sure and get something that isn't going to foam up for this application.
What is a GL3 lubricant? I'm familure with 4 and 5, but not 3.
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Just a word of advice- don't run your primary 15k-20k miles on any oil. There's no filter on the primary so all the clutch material, wear metal, etc. just floats around in the oil. I had MTL in mine last go-round and after 4100 miles the oil still looked good, but there was a lot of ---- on the magnet and in suspension. No way would I go more than 5k miles between oil changes on the primary. It only holds one qt, so it's not like it'll break the bank for me to change it every time with the engine oil.
I switched back to Formula+ after that one run with MTL- MTL is good stuff but my clutch seems to like the Formula+ better...
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...I agree with your comments about debris & contamination. My point is that you will never exceed the limits of the MTL and it's only 2 bucks more. I found 5 qts on a close out table for $2 each so I am set for a long while...