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[BaggerProud]

I'm doing my first time fluid change on my new (to me) 2005 SEEG. What is the best weight oil to use for the motor, tranny, primary?  MOCO says one size fits all - Syn3 - but I'm havin' a hard time believing that. Never used synthetic oil before cuz my old girls never needed or wanted it but now. Well it's a new day and age!!! Any input will be greatly appreciated. Thanks. 

[donald p]

RED LINE in the tranny and  SYN3 in the other two.

[efrbc1]

Mobil One V Twin 20-50 in the motor, BelRay 85-140 Hypoid Gear Oil in the tranny, and Mobil One 75 Synthetic Gear Oil in the primary on my '05 SEEG.

Chris

[yellow103]

Amsoil 20-50 syn all the way around, been using it in my bikes for many many years, not one issue as of yet.

[skratch]

redline 20-60 in the engine
rotella t 15-40 in the primary
amsoil severe gear in the tranny

as many replies as you get, you will get different recommendations.  find one that you like, and just change the oil on a regular basis and you'll be fine.

[dlaws01]

 

[Jswerve]

OH MY GOD !!!!!!!!!!!!!!!!!!!!!!!!!! PLEASE STOP!!!!!!!!!!!!!!!!!!!!!!! Just change it with your preferred fluids that meet/exceed the manufacturers recommendations at recommended interval and you will be fine!!!!!!!!!!!! 

[cahdbiker]

X2  Also, great looking bike!

OH MY GOD !!!!!!!!!!!!!!!!!!!!!!!!!! PLEASE STOP!!!!!!!!!!!!!!!!!!!!!!! Just change it with your preferred fluids that meet/exceed the manufacturers recommendations at recommended interval and you will be fine!!!!!!!!!!!! 

[BaggerProud]

OH MY GOD !!!!!!!!!!!!!!!!!!!!!!!!!! PLEASE STOP!!!!!!!!!!!!!!!!!!!!!!! Just change it with your preferred fluids that meet/exceed the manufacturers recommendations at recommended interval and you will be fine!!!!!!!!!!!! 

Damn gentlemen, sorry for the ignorant question. Didn't realize that the masters of all things Harley would take such offense!!    To us who are of lesser knowledge and was under the misunderstanding that friendly advise could be sought here, I apologize.
That being said, thanks to those guys that did give me an answer. And to the others 
PS. Just FYI - Red is such a common color. 

[grc]

For those who jumped in with both feet to promote a brand, here's the title of this thread again:

Best weight oil for motor? Trans? Primary?

Motor Oil - 20w50

Trans - 75w90 gear oil (90 weight gear oil is roughly the same viscosity as 50 weight motor oil btw)

Primary - not terribly critical, most important characteristic is compatibility with a wet clutch.  Anything from ATF to 10w30 to 20w50 (or gear oil equivalents)

Jerry

[North Georgia Hawg]

Damn gentlemen, sorry for the ignorant question. Didn't realize that the masters of all things Harley would take such offense!!    To us who are of lesser knowledge and was under the misunderstanding that friendly advise could be sought here, I apologize.
That being said, thanks to those guys that did give me an answer. And to the others 
PS. Just FYI - Red is such a common color. 

Please understand that "oil threads" are asked with regularity here and on other forums - to the point of extreme annoyance. If you search on "oil" you will get literally hundreds of hits. These threads tend to drive many members nuts!

Anyway, Jerry posted what you should use as far as oil weights for the engine, primary, and tranny.

If you don't have a Genuine H-D Service manual for your model and year - plus the CVO supplement for your specific bike - I suggest you purchase one ASAP, and get familiar with it. It's the best investment you can make. It lists all of the information you need.

Having said that, many of us have used LOTS of different lubes on our bikes over the years. I have used many as well.

Currently, I have Mobil 1 V-Twin Syn 20W-50 in the engine - but any 20W-50 is OK as ling as it meets the stated requirement for your engine. I have also used AMSOil MCV 20W-50 and it is an excellent oil as well. H-D Syn3 is "recommended" for use in all three places, but I personally don't use it anywhere. It is a good oil though.

I use Red Line Shockproof in the tranny - but I have also used Mobil 1 Syn 75W-135 Gear Lube in it. I like them equally well... either one will lubricate the tranny well, and will keep it relatively smooth-shifting and quiet. The tranny needs a good, thick gear lube in it - to cushion the gears in there.

I currently use a mixture of 70% H-D Formula+ and 30% Mobil 1 Syn ATF in the primary - but Formula+ alone is perfectly fine. As Jerry said, the primary isn't as critical... the fluid in it is there primarily to cool the wet clutch, and to lube the primary chain. I think that a 20W-50 motor oil is too thick for the primary, despite the H-D recommendation to use Syn3 in it. I have used AMSOil 20W-50 in the primary on previous bikes - but it can make it more difficult to find neutral because of it's relatively high viscosity. The primary needs a thinner lubricant such as Formula+ or an ATF without friction modifiers... these can cause clutch slippage.

Hope this helps.

Ken

[110tHunDer]

 
The size of Jwerve's sig pic is fairly annoying, too.  Or, should I say ".... too!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"

[Jswerve]

The size of Jwerve's sig pic is fairly annoying, too.  Or, should I say ".... too!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"

Yeah I figured mine was bigger then yours.  

[North Georgia Hawg]

Yeah I figured mine was bigger then yours.  

So, it's all about size? Well, there IS no replacement for displacement!

Ken

[BaggerProud]

Thanks Jerry. What I was looking for was the weight, not a brand, because I've read thru a number of threads and I couldn't figure 1) if weight was extremely relevant in all areas and 2) if so what guys were using as the MoCo one size fits all made no sense to me.
Thanks North Georgia. Got the manuals and reviewed the MoCo recommendations/requirements. I've learned over the years that guys with experience like you and Jerry have found better alternatives or tweaks to manufacturing "specs" and the reasoning is usually spot in. Your use of a 70-30 mix is case in point. Why the mix? What benefits have you found?