Moco recommends GL-1 spec in the tranny.........doesnt matter what name is on the label.......But I prefer Amsoil.

 

Just curious where you got that information at?

The original Harley transmission fluid was semi-synthetic gear lube GL-5. It has been that way for along time.My second choice would be GL-4.....but that would be it.

Perhaps Harley is actually recommending GL-1 in the transmissions. If that is the case, no wonder why they are recommending motor oil in the transmissions. Which in my opinion only.....Harley is completely wrong for recommending motor oil in the transmission. Companies that claim that you can use their motor oil in the transmissions are also wrong.

I believe Harley and other companies are only recommending motor oil for transmissions on a marketing scheme.This would probably attract more potential customers, because the maintence is much more simplified by saying "Same fluid for all three holes." In a way, I belive it is a practice to help compete with the metric cycles.....since they all pretty much share the same fluid. Furthermore, Harley is recommending SNY3 for all three holes.....so now a customer will buy a case of SYN3 at the store.....which is really expensive. Harley is making alot of money on this marketing plan. Some bikes can take up to six quarts to perform one service....expensive. Over $60 or more for a service....just in fluids.....rediculous.

It use to be that, one would buy one quart of transmission fluid, one quart of primary fluid, and 3-4 quarts of the engine oil of their choice. This is still alot less than using the One fluid for all technique and you get better protection this way.

In my opinion, put an engine oil of your choice in the engine only. Just use the correct viscosity and change when needed. Put a gear lube GL5 in the transmission only. For the primary.....use something between 10w40 through 20w50 or ATF.

Marketing folks.....

 

Lost1:

I'm using the new Spectro as areseveral other '06/'07 Ultra riders, and the concensus is we will not run anything else in our trannys! It's that good!

https://www.hdforums.com/m_1732578/tm.htm

 

I would use Spectro BUT:

1> Cant find it ANYWHERE locally.
2> Spectro Oils wont return emails.

So im using Royal Purple Max Gear 75w90 in trans

 

Dennis Kirk sells the new Spectro Platinum 6-speed tranny oil for about $17 a qt. I think I'll give it a try next time I service my transmission- in the Spring. Thanks for the feedback!

 

deleted

 

Any bike shop that carries a specto line should and would probably order it for you. That's how I had to get mine. It took three days but I got it. BTW....I'm stickn' with it. and I was also using the amsoil 75-90 before, but the s6 speed made a considerable improvement.

 

Have any of you tried Redline HD Shockproof. Not knocking the Spectro and it sounds like a great lube but , wow, 17 bucks a qt.??????

This price for MC stuff as opposed to mass marketed lubes is really getting out of hand.

JMHO
EZ

 

I'm using Shockproof Heavy now. It's $10/qt for the "regular" stuff, $12/qt for the "V-twin" () variant.
It's great oil but I'm looking for something than can reduce the 5th gear whine a bit more.

The Spectro Platinum is exhorbinately priced, but if it does the job I don't mind paying for it once a year. If it doesn't I'll just say screw it and get $4/qt synthetic gear oil from Wal-Mart. If plain dino gear oil can protect tractor-trailer differentials & gearboxes that see 80,000 lbs. as a daily worlkload, these tiny little HD trannys that only have to haul 1000 lbs. and see new fluid annually certainly won't ever break down a synthetic gear oil...
And you're right- m/c specific lubes are a screwjob, especially for a Harley that doesn't have a shared engine/tranny sump.
That's why I run $4/qt Mobil 1 15W-50 synthetic instead of the $9/qt V-Twin stuff. Same oil, half the price.

 

Try the Redline Shockproof heavy. 75w250.