SYN 3 + cold temps
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From: Honah Lee
75-90,130>>
I have run syn 3 in temps into the teens without an issue. It works fine. May not be the cheapest oil around, but it will do the job. Harley still to this day says to run it all three holes, just check their website. It has a gl1 rating which is all a light duty low horse power trans needs. Gear oil is the same wt as motor oils with less additives, so if you think 75/90 wt gear oil is some super thick honey that gives superior protection, your missing the point. You can run 10/40 wt oil in the winter if your due for a change, but if not keep the 20/50 in there you'll be fine.,,
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From: Honah Lee
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From: back home in Michigan
Never said i was going to use it the trans! I wouldnt use any engine oil in the trans. Like I had said in my original post (if you read it) I asked a simple question about the cold pumpability of Syn3 over HD360 and dont give a rats a$% about other brands. The only difference between HD oils and all the high end brands is HD isnt getting on these forums and shoving there oil down everybody's throat and pulling out some ''White papers'' like a pistol.
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Tourer
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From: texas
Big Kahuna HDF Member
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From: USA
Actual you are very correct since most of the 75->>> oils are GL5 rated meaning they have an anti friction additives added that Harley and the manufacturers of said brand oils say not to use in in the transmission. I ran it for a while a few months ago testing oils in my transmission and primary but after the test were done I took the GL5 out of the transmission. Never did the ATF oil test in the primary test due to warnings from the manufactors.
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From: Honah Lee
This was from the Mobile Site.
Question: Does Mobil 1 Synthetic Gear Lube Corrode Yellow Metals?Is Mobil 1 Synthetic Gear Lube LS 75W-90 gear oil OK to run in Harley Transmissions? The big buzz on the internet chat rooms is that it corrodes "yellow" metals, such as brass and copper. Is this true? Please answer THIS question.-- Michael Carravetta, Janesville, WI
Answer: Unless the transmission specifically recommends an API GL-5 fluid for your transmission, it should not be used. GL-5 gear oils are designed for gears that require a high level of EP (Extreme Pressure) additives to protect gear teeth under extreme stress. Unfortunately, these same additives can be very aggressive toward “yellow metals “and are generally not recommended where copper, brass and bronze components are used.
Question: ATF Choices for a Harley-Davidson FLHT PrimaryI have been told that many Harley owners use Type F (Ford) ATF in their primaries, for one thing to make it easier to find neutral. I have some Mobil 1 Synthetic ATF Multi-Vehicle Formula that I was thinking about putting in my FLHT primary, but the back label states that it's not recommended for Type F applications. I don't want to put it in my primary if it has a lot of friction modifiers in it because I don't want to cause clutch slippage. What are your thoughts on using this ATF in a Harley primary? Thanks.-- Ken Carpenter, Buford, GA
Answer: Although an ATF may work, we suggest shying away from using it due to the low viscosity of ATFs and the possibility of premature chain wear and/or noise.
Last edited by Jackie Paper; Oct 12, 2010 at 08:06 AM.
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From: Honah Lee
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From: back home in Michigan
LOL, you flatter yourself....lol, but that avatar sure hits a nerve!
I just don't want anyone who reads this to think that all these oils mentioned are comparable. There have been some long winded discussions over the differences in oils and there are many far superior oils compared to Syn3. Syn3 is not a pure synthetic, and pure synthetics are usually a better quality oil with many having a far higher 'flashpoint'. I have read several in depth studies concerning these different oils, all by impartial parties, not by any oil manufacturers.
Believe it or not, use what you want. Its no skin off my azz.
I just don't want anyone who reads this to think that all these oils mentioned are comparable. There have been some long winded discussions over the differences in oils and there are many far superior oils compared to Syn3. Syn3 is not a pure synthetic, and pure synthetics are usually a better quality oil with many having a far higher 'flashpoint'. I have read several in depth studies concerning these different oils, all by impartial parties, not by any oil manufacturers.
Believe it or not, use what you want. Its no skin off my azz.
Tourer
Joined: May 2005
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LOL, you flatter yourself....lol, but that avatar sure hits a nerve!
I just don't want anyone who reads this to think that all these oils mentioned are comparable. There have been some long winded discussions over the differences in oils and there are many far superior oils compared to Syn3. Syn3 is not a pure synthetic, and pure synthetics are usually a better quality oil with many having a far higher 'flashpoint'. I have read several in depth studies concerning these different oils, all by impartial parties, not by any oil manufacturers.
Believe it or not, use what you want. Its no skin off my azz.
I just don't want anyone who reads this to think that all these oils mentioned are comparable. There have been some long winded discussions over the differences in oils and there are many far superior oils compared to Syn3. Syn3 is not a pure synthetic, and pure synthetics are usually a better quality oil with many having a far higher 'flashpoint'. I have read several in depth studies concerning these different oils, all by impartial parties, not by any oil manufacturers.
Believe it or not, use what you want. Its no skin off my azz.