Topic: HD owners: fluids/oils?  (Read 2334 times)

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Offline heymynameisfred

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HD owners: fluids/oils?
« on: 03/22/10 12:35PM »
hey guys, new to the HD world, but i'm trying to get a feel how things work on this end.

with most motorcycles im used to, they all use a shared sump design where oil is shared with the engine and transmission. HD's on the other hand have the engine, primary, AND transmission. not too clear on the design, but im assuming the primary contains the clutch? and transfers power from the output shaft of the engine and inputs into the trans?

im trying to also get a feel for what fluids ppl run, seems that m1 20w50 is popular in the engine, ATF in the primary, and m1 gear lube in the transmission. why gear lube in the trans? i understand that there isnt a clutch or anything else to worry about in the trans when using an ILSAC GL-5 fluid in there, but i suppose it would make sense that the add pack is designed for an environment like the transmission.

i've also seen m1 20w50 in all 3, or rotella 15w40 in the primary.

why atf in the primary? is it because the clutch is in the primary? similar to how a torque converter works in an AT car?

what about rotella 5w40 synthetic in the engine? or all 3 for that matter?

just trying to get a better understanding of how HD does things, any input would be greatly appreciated.

Offline heymynameisfred

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Re: HD owners: fluids/oils?
« Reply #1 on: 03/22/10 03:18PM »
bumpity bump...

Offline heymynameisfred

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Re: HD owners: fluids/oils?
« Reply #2 on: 03/22/10 04:01PM »
ok so i've kind of made up my mind...

mobil1 75w90 gear lube in the transmission...75w140 from what i can tell is really thick and unnecessary for a motorcycle engine. plus it costs a bit more for little to no benefit. i hope that this visc is robust enough and will hold up well. m1 is easily obtainable at a competitive price compared to boutique oils, and perform well.

i can pretty much run anything >= 40wt in the primary, so whatever goes in the engine will probably go in the primary, as long as it doesnt have any moly in it. lighter/synthetic oils supposedly create less clutch drag, such as when starting the engine while pulling in the clutch in 1st gear.

as far as the engine goes, i have no idea yet. id like to run t6 5w40 (because i run it in basically everything else) but im afraid it might be a bit too thin. V100C is around 15 cST, where m1 15w50 is like 18 cST. i dont have to worry about shearing in the crankcase because its not a shared sump. probably should look at the HT film strength numbers. if anything, it will be m1 15w50, which is nearly identical to m1 vtwin 20w50 at maybe 60-70% of the cost.

Offline Whore-Hey!

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Re: HD owners: fluids/oils?
« Reply #3 on: 03/22/10 04:30PM »
I've been running m1 v-twin in the engine & primary and m1 gear oil in the trans for 33K miles now with no problems... can't answer your other questions but it's been working awesome for me.

As for the gear oil I've tried both 75/90 and 75/140, personally I really like the 75/140 a lot better... they both worked fine but the transmission just seems to run quieter and shift smoother with the 75/140 in it.

Offline heymynameisfred

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Re: HD owners: fluids/oils?
« Reply #4 on: 03/22/10 04:40PM »
damn FINALLY got some feedback! haha thanks man. is the 75w140 easy to find? autozone?

have you run any other oils in the engine/primary? wondering if you might be able to compare them...im dead set on m1 GL for the transmission though, unless theres a really really good argument for me not to.

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Re: HD owners: fluids/oils?
« Reply #5 on: 03/22/10 05:00PM »
 :32: yeah not a big harley fan base on this forum... check out www.hdforums.com for all the info you could ever need, also check out www.zanottimotor.com for 20% off or better on most parts and upgrades you might want to buy.

yep I buy both oils at autozone, but they don't always have it stock so I always call first... if not pep boys sells them too and for about the same price. I did try the harley syn3 in all 3 holes once and then drained it less 1k miles later... my engine just seemed to run hotter and clunk more when I shifted :26:

Offline kglesq

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Re: HD owners: fluids/oils?
« Reply #6 on: 04/21/11 11:48PM »
At risk of necromancing this thread:

Run M1 20/50 V-Twin.  There is a report put together by Amsoil that shows M1 and Amsoil were essentially neck and neck, with each slightly outperforming the other in discrete areas, for a basically dead-even average performance.  They were well better than the next closest competition.

I have the 20/50 in all 3 holes, but may switch to gear oil in the trans on the next change.

I would not go with any viscosity lower than 20/50 in the motor.  Assuming you're talking about a TC88 motor, they run quite hot.

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Re: HD owners: fluids/oils?
« Reply #7 on: 04/22/11 08:11AM »
My buddy rides a 1200 Sportster and he swears by Bel-Ray 10w50 Synthetic V-Twin Oil (i think they ony make the full synthetic in that weight, but they make the synthetic blend in 20w50 if thats what you prefer)...he also uses their V-Twin Transmission Oil which I believe is 85W140. BelRay also makes 80W Primary Chaincase Lubricant as well as 85W Sport Transmission Fluid (the really good red stuff).
« Last Edit: 04/22/11 08:14AM by corseracing »

Offline DARK STAR KAOS

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Re: HD owners: fluids/oils?
« Reply #8 on: 04/22/11 08:12AM »
At risk of necromancing this thread:

Run M1 20/50 V-Twin.  There is a report put together by Amsoil that shows M1 and Amsoil were essentially neck and neck, with each slightly outperforming the other in discrete areas, for a basically dead-even average performance.  They were well better than the next closest competition.

I have the 20/50 in all 3 holes, but may switch to gear oil in the trans on the next change.

I would not go with any viscosity lower than 20/50 in the motor.  Assuming you're talking about a TC88 motor, they run quite hot.

+1 I run the Mobil in all three holes 1 qt, primary, 22oz in tranny, 4 qts in engine you can by the stuff at Autozone or kragen for 9 bucks a qt,

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Offline freezerburn

Re: HD owners: fluids/oils?
« Reply #9 on: 04/22/11 10:31PM »
 I had an Buell Xb12r.  You cant go wrong with Formula + in the primary.  Mobil 1,  Amsoil,  Redline for the motor oil.  Or you can try a very interesting oil.  A brand that I use and you can use in all 3 cavities just like the big name brands. 

http://www.kalgard.com/products/products.asp?cat=11

Their base oil is derived from Chevron Delo Diesel Oil.  It has been some great stuff I have been primarily using it for the past 3 years. 
I think everybody should get rich and famous and do everything they dreamed of.  So they see that it is not the answer.

 

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