The recommended engine oil for all Harley Davidson models. We have researched the right oil to the best of our ability but it goes without saying: always consult your owner’s manual where you will find the manufacturer’s recommended engine oil. With our oil selector, you’ll be able to choose a premium oil but save a few quid on the official Harley engine oil. That’s why it’s often better to choose a synthetic-based oil over a mineral (regular) oil as it’ll have better heat tolerance. In air-cooled engine (like the ones found in most Harleys), heat can be an issue.
Whether you’re running a 103, a Twin Cam or a Softail and whether you run Synthetic or Regular oil, the right oil will make all the difference. In other words, a 80w-90 gear oil is much thicker than a 5w-30 engine. For starters, gear oil can come in much higher viscosity ratings. The chances are, your recommended oil will be 20W50 as that’s the most common grade for Harleys. Regardless of what your manual transmission uses, the fluid or oil’s primary function is lubricationpreventing metal-to-metal contact between the meshing gears.
The chart below shows you the recommended engine oil and the amount of oil you need for each model. However, since most other motorcycle oils shear back to a 40 weight when used in harley crankcases, it would not hurt anything. You will also be able to run your engine quieter and it will be more enjoyable. While H-D supply their own oil, you definitely don’t have to use it to ensure your Harley runs smoothly. You can use either a 10w 40 or a 20w 50 or a 60w 60 weight in the crankcase if you want to use the primary. This guide is designed to help you find the best oil for your Harley.
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