Transmission/Primary Lube
#1
04-04-2018, 06:43 PM
#2
04-04-2018, 06:48 PM
Cruiser
I use this and just change very other oil change
https://www.denniskirk.com/drag-spec...ad=45713335117
https://www.denniskirk.com/drag-spec...ad=45713335117
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Jaystn62 (04-04-2018)
#4
04-04-2018, 07:12 PM
Road Warrior
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Jaystn62 (04-04-2018)
#5
04-04-2018, 07:23 PM
#7
04-04-2018, 08:06 PM
Tourer
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#9
04-04-2018, 08:40 PM
I went from a synthetic gl-5 75w/90 house brand gear oil to Harley's formula +. I haven't rode yet since using the formula +, but part of the reason for the change was a noise that seemed to be coming from the primary and nothing found when I inspected, so I figure a change in fluids could potentially be one variable eliminated in searching for the issue.
Also, I'm just not sure how a gl5 oil with friction modifiers would work with the sportster transmisoin and especially the wet clutch. I remember running gl5 oil in my 4 speed in my drag car and it wreaked havoc on the brass synchronizers, so I'm a little leary using gl5 oil when Harley's own is gl1....not saying it can't be done, but it just makes me wonder why would their oil only have that rating and it is specifically formulated for hd bikes.
just my .02 cents
Also, I'm just not sure how a gl5 oil with friction modifiers would work with the sportster transmisoin and especially the wet clutch. I remember running gl5 oil in my 4 speed in my drag car and it wreaked havoc on the brass synchronizers, so I'm a little leary using gl5 oil when Harley's own is gl1....not saying it can't be done, but it just makes me wonder why would their oil only have that rating and it is specifically formulated for hd bikes.
just my .02 cents
#10
04-04-2018, 08:44 PM
Road Warrior
Here is Red Lines official response -
Thank you for contacting Red Line Oil, in the shared Sportster primary/transmission the 75W90 is recommended, a product that has been used extensively and performs well.
The 75W90 is the product we have have used for a number of years with very good results in Sportster/Buell transmissions, matching the viscosity and type fluid called for.
The 80W Motorcycle Gear Oil is a lower viscosity than called for, the ShockProof gear oils can due to their unique characteristics could cause sticking of the Harley clutches.
The 75W90 would be preferred and recommended over 80W Motorcycle Gear Oil in these applications.
There can be issues with some GL-5 gear oils in certain applications. Some can be corrosive to brass, bronze or copper, not an issue with our GL-5 gear oils, they don’t cause corrosion, pitting or metal removal. In a synchro equipped transmission the friction modifiers contained in many gear oils can make them too slippery, though not the case in a motorcycle transmission with dog rings.
So if you want the right viscosity and dont want to worry about it damaging anything, go with Redline http://www.redlineoil.com/product.aspx?pid=133&pcid=4
Thank you for contacting Red Line Oil, in the shared Sportster primary/transmission the 75W90 is recommended, a product that has been used extensively and performs well.
The 75W90 is the product we have have used for a number of years with very good results in Sportster/Buell transmissions, matching the viscosity and type fluid called for.
The 80W Motorcycle Gear Oil is a lower viscosity than called for, the ShockProof gear oils can due to their unique characteristics could cause sticking of the Harley clutches.
The 75W90 would be preferred and recommended over 80W Motorcycle Gear Oil in these applications.
There can be issues with some GL-5 gear oils in certain applications. Some can be corrosive to brass, bronze or copper, not an issue with our GL-5 gear oils, they don’t cause corrosion, pitting or metal removal. In a synchro equipped transmission the friction modifiers contained in many gear oils can make them too slippery, though not the case in a motorcycle transmission with dog rings.
So if you want the right viscosity and dont want to worry about it damaging anything, go with Redline http://www.redlineoil.com/product.aspx?pid=133&pcid=4