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Is 70W-140 Oil too Heavy for a Harley-Davidson Transmission?
I cannot seem to find the answer, so here's my question, "What is your closest grade of oil for a '04 Harley 5-speed transmission and a later model 6-speed with a helical cut 5 and 6 gear?" We have an...
An SAE 140 viscosity grade may be too heavy of an oil. We recommend you try Mobil 1 Racing 4T 10W-40 which is designed for and capable of lubricating transmissions, as this product is used in common s...
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...
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)...
Sorting Out the Lubes for a Harley-Davidson Dyna Wide Glide
I have read your question and answers regarding oils in a Harley with separate case, trans, primary. I have been using Mobil 1 V-Twin 20W-50 in all three holes. I am all about optimal product use and ...
We recommend that you keep doing what you're doing and use Mobil 1 V-Twin 20W-50 in all three applications. By using a premium synthetic like Mobil 1 you are already using a high performance lubricant...
ATF Choices for a Harley-Davidson FLHT Primary
I 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 t...
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. We recommend Mobil 1 Racing 4T 10W-40 for Harl...
Should ATF or Motor Oil be Used in a Harley-Davidson Primary
I understand that there are some people who are touting the benefits of using ATF in a Harley primary. What are your thoughts on using ATF in the primary vs your 4T 10W-40 motorcycle oil?
Automatic transmission fluid (ATF) would probably work fine in your primary but in the end you will have to decide if you are satisfied with its performance.  Every biker “feels” his shifts and knows ...
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