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HD never said it was the same thing, nobody even suspected it was the same thing, as soon as you open the bottle of Formula+ it is obvious (it doesn`t stink like the sport trans lube).
Can you find a post online anywhere where using Formula+, or any gear lube for that matter has caused premature wear in a 5 speed or 6 speed transmission?
Have you ever disassembled a Harley Davidson transmission and looked at the parts?
This is a perfect example of Analysis Paralysis.
Dump some Gear Lube or Formula + into the machine and ride.
No, can you? That'd actually be an interesting study to read. Please, by all means, post up!
Again, no, have you? I'll go out on a limb here and suggest with the proper lube, tearing it apart wouldn't be needed?
No. If HD engineers thought it needed a 50 weight, I'm guessing they would've filled it with such. Or ATF. They designed and built it. I'll concede they know what lube and additives to use. But hey, your bike/your money.
Have you decided which formulation of transmission oil you are going to use yet?
I put Putoline Formula V-Twin semi-synthetic 20-50 in my Sportster and it loves the stuff. It is formulated for V-Twin motorcycles in The Netherlands by nice friendly clog wearing Dutch people. It costs me Ł34.00 for four litres, but it's worth it's weight in gold to me.
I use red Line 75W90 Gl5 gear oil in my primary and trans. Have never had any issues at all.
Red Line Email...
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
The more synthetic base oil contained in a motor oil in general the better the performance. In turn, a full synthetic motor oil formulated with a robust additive system will always be better than synthetic blends. That said a properly formulated semi-synthetic can offer performance benefits over a conventional motor oil.
Not sure I understand the rationale for semi synthetic oil. Either stay dino or go full synthetic IMHO.
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