Our answer: It is perfectly acceptable to use 75W-140 gear oil in Harley-Davidson transmissions.
What weight oil do I use in my Harley transmission?
The optimum product would be Mobil 1 RacingTM 4T 10W-40 motorcycle oil , but it is also okay to use Mobil 1TM V-Twin 20W-50.
Can I use 75w90 in my Harley transmission?
It's a synthetic gear oil . It will be just fine in the trans. I would recommend using gear oil in there over motor oil.
Can I use 20w50 in my Harley transmission?
A particularly nice feature about AMSOIL 20W-50 Synthetic Motorcycle Oil is that it can be used in the engine, transmission and primary chaincase of Harley-Davidson motorcycles.
Can you use ATF in Harley transmission?
ATF is specifically made to work with wet clutches in an automatic transmission , so it make sense that it should be good for a wet clutch in a Harley. As for the concerns about wear, ATF has been used for a long time in some automotive manual transmissions and all wheel drive transfer cases.
What is the best oil to put in a Harley-Davidson transmission?
For the record, AMSOIL recommends AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil in the engine, transmission and primary chaincase on most Harleys (consult our Motorcycle Product Guide for specific recommendations).
What type of oil goes in a Harley primary?
You actually have a couple of choices for the primary drive. The optimum product would be Mobil 1 RacingTM 4T 10W-40 motorcycle oil , but it is also okay to use Mobil 1TM V-Twin 20W-50.
How often should I change the transmission oil in my Harley?
How often should I change the tranny oil in my Harley? According to the manufacturer's service manual, you should change the engine oil at 5,000 miles. Primary oil should change at 10,000 miles, and trans fluid at 20,000 miles. A transmission oil change should happen every year .
How often should I change the primary oil in my Harley?
Oil changes as per Owners manual every 5k Miles, Tranny and Primary every 10K . If you ride it more you'll be changing it more often.
Can you use ATF in Harley primary?
We submit that ATF is too thin for Harley primary use . It's true that many Harley riders have had years of problem-free performance with ATF. We contend that a thicker oil will provide superior metal-to-metal wear protection. Chains and sprockets will last longer using a fluid with an appropriate viscosity.
Can I put 20W50 in my motorcycle?
the 20w50 is perfect for summer riding because it protects a bit better in the high temps. as long as its motorcycle specific you can pretty much run any weight oil .
What viscosity is Harley primary oil?
The 20W-50 motorcycle oil's viscosity is right in the “sweet spot” for optimum operation in all three holes and the volumes of positive reviews we receive back this up. Gear lubes do contain heavy doses of “extreme pressure” additives which many believe prevent transmission wear and provide quieter operation.
Can you use 20W50 Motorcycle oil?
Suitable Vehicles. Depending on the recommendations for the particular vehicle, 20W50 oil is suitable for large or small diesel engines , gasoline engines, motorcycles and aviation vehicles. It is also suitable for both air- and liquid-cooled engines.
What does a Harley primary do?
The primary drive consists of an engine output sprocket or pulley (attached to the crankshaft), clutch assembly , roller chain or belt, and housing that encloses the entire assembly. The purpose of the clutch is to engage the primary drive to the transmission.
How much primary fluid is in a 103?
I am aware that it takes three quarts of oil. The primary is only supposed to be filled up to the BOTTOM of the clutch spring. Start with one QT and add little by little until the level reaches the bottom of the shiny ring at the bottom of the clutch pack housing.
