Royal Purple Question
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Tourer
Joined: Jul 2011
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From: Weymouth MA
Royal Purple Question
I bought a bottle and after getting home I read it says not to use in wet clutch. The clutch system is under the primary cover. So i am safe to assume I can add this stuff to the tranny? Or should I return it
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
best not to mix fluid types/brands
If changing to a new brand primary fluid ( in which the clutch is bathed), drain the primary and work the clutch to make sure the old stuff all goes- if you are in there anyway, you could pull the discs and plates to get the old stuff off.
Once clean, soak in the new stuff.
and put back together
Mike
If changing to a new brand primary fluid ( in which the clutch is bathed), drain the primary and work the clutch to make sure the old stuff all goes- if you are in there anyway, you could pull the discs and plates to get the old stuff off.
Once clean, soak in the new stuff.
and put back together
Mike
Road Warrior
Joined: Oct 2008
Posts: 1,692
Likes: 22
From: Denham Springs, La
I've used RP 75/90 in my transmission with no problems. I use RP 20w50 in the engine. I use HD Formula + in my primary. I'm back to using 75 or 85w whatever dino oil in my transmission. Everything works great.
Seasoned HDF Member
Joined: Jan 2007
Posts: 20,616
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From: anacoco, la
sometimes it seems like pulling teeth to get an answer doesn't it? yes, you can use it in the tranny. i too use formula + in the primary. change it out every engine oil change even though the book says it can go 10k. it just feels better after putting fresh fluid in. the tranny, i take out to 10k (every other engine oil change).
just makes it easy to remember, change engine and primary every 5k, and change tranny on the 10k mark.....
just makes it easy to remember, change engine and primary every 5k, and change tranny on the 10k mark.....
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
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From: Baton Rouge, LA
Which RP product are you planning on using in the tranny? RP is rich in moly, which is an excellent friction modifier that is good for most mechanical applications but should be avoided in the primary. The reason is that the clutch disks need a certain amount of friction to work properly and moly increases lubricity. I would use their MaxGear hypoid gear oil in the tranny (85w140 works well), 20w50 non-MC oil in the engine, and a good fossil engine oil like Castrol GTX 20w50 or Rotella T in the primary. Formula+ is HD's offering for the primary, but IMO is overpriced for an environment that doesn't need an expensive oil.
BTW, I agree with Skratch's service-interval recommendations on the primary and tranny.
BTW, I agree with Skratch's service-interval recommendations on the primary and tranny.
Last edited by iclick; Mar 20, 2012 at 08:53 PM.
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Tourer
Joined: Jul 2011
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From: Weymouth MA
sometimes it seems like pulling teeth to get an answer doesn't it? yes, you can use it in the tranny. i too use formula + in the primary. change it out every engine oil change even though the book says it can go 10k. it just feels better after putting fresh fluid in. the tranny, i take out to 10k (every other engine oil change).
just makes it easy to remember, change engine and primary every 5k, and change tranny on the 10k mark.....
just makes it easy to remember, change engine and primary every 5k, and change tranny on the 10k mark.....
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Tourer
Joined: Jul 2011
Posts: 464
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From: Weymouth MA
Which RP product are you planning on using in the tranny? RP is rich in moly, which is an excellent friction modifier that is good for most mechanical applications but should be avoided in the primary. The reason is that the clutch disks need a certain amount of friction to work properly and moly increases lubricity. I would use their MaxGear hypoid gear oil in the tranny (85w140 works well), 20w50 non-MC oil in the engine, and something else like Castrol GTX or Formula+ in the primary. You could use 20w50 engine oil in the tranny, but since it is a gearbox I would use gear oil.
I plan on 20/50 Mobil 1 Syn in engine and Primary And RP max gear syn in the tranny
Tourer
Joined: Jan 2012
Posts: 419
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From: Central IL
I have used Mobile 1 20w50 MC oil in the primary and RP 75w90 in the transmission for a few years now with no problems. In fact the RP resulted in a quieter transmission as compared to dino gear lube. 06EG
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