What oil should I run in my Harley?

Last Updated: September 19, 2022 by Harley Insider
Home » Tips » What oil should I run in my Harley?

Oil is a very hard subject that anybody has any opinions about. So it should be interesting, right?
The “right” type of oil can depend on many factors such as how you plan to use your bike (commuting vs touring), the season in which it operates (winter/ons consortium with heavier oils than hydro-conventional ones), and personal preference; but there’s one thing everyone needs when they start their motorcycle journey: knowledge!

So what kind of oil do I run?

  • Screamin’ Eagle SYN3
  • Red Line
  • Mobil 1
  • AMSOIL
  • Bel-Ray
  • Royal Purple

Any good oil will work in your engine. And any that is designed for transmissions are also fine to use on a bike, you cannot hurt the machine with these oils! There are many people who love using Mobil 1 or AMSOIL products because they’re not bad at all but there’s no right answer when picking which one you should go with – it largely depends on what type of vehicles each has been recommended more often than others over time by professionals who know their stuff best (i..e mechanics).

Amsoil Oil on Harley
Check current Amsoil price on Walmart

A lot of people say that using Royal Purple, or another type of oil, will make your bike better. But we can’t guarantee it because other brands might give out more miles than the number we think they should. And don’t forget that many riders think one oil is always going to work best for them.

I don’t like how the top end clatters. So I run Red Line, in the engine. In the transmission, I’ve tried different oils but found that Red Line ShockProof is best for me because it does not make too much noise. Sometimes Harley oil works better in my primary gear. I have tried many types of oil but none work as well as ShockProof for me.

We want to say there are three important things.

Oil level

One is to run the oil at the correct level. And as you see on the picture, that’s halfway between the add quart mark and the full mark.

Number two important thing while riding a motorcycle is to ensure that you have the right weight oil for your ambient temperature. So if possible get whichever one says “Low” or lower rather than higher unless it’s extremely hot where then go ahead and choose whatever seems appropriate at the time being!

H-D TYPEVISCOSITYH-D RATINGLOWEST AMBIENT TEMPERATURECOLD WEATHER STARTS BELOW 50°f (10°c)
H-D MultigradeSAE 10W40HD 360Below 40° F (4° C)Excellent
H-D MultigradeSAE 20W50 HD 360Above 40° F (4° C)Good
H-D Regular HeavySAE 50 HD 360 Above 60° F (16° C)Poor
H-D Extra HeavySAE 60 HD 360 Above 80° F (27° C)Poor
Recommended Engine Oils

The third thing is to make sure your oil doesn’t get too hot. Harley says that the correct operating temperature should be no higher than 230 degrees. that’s really important that you don’t cook your oil, you’ll cook all the additives out of it. So with that said, any motorcycle, air-cooled motorcycle-rated oil is going to work in your engine.

FAQs

What type of oil does a Milwaukee 8 take?

Five quarts of synthetic 20w-50 engine oil.

Best Oil for Milwaukee 8?

I have tried many different oil brands and personally recommend Redline Oil. None of the other brands of oil works as well for me.

How often do you change oil on Milwaukee 8?

it is recommended to change the oil on your Milwaukee 8 every 5,000 miles. If you don’t complete 5,000 miles for a full year after your last change of oil, I would recommend to change it.

Finally

So long story short, change your oil often. Don’t let it get too hot and lose its viscosity. Use whatever you want as long as it is rated for a motorcycle, in particular a V-twin. It has the correct additives in it and will last until your next oil change. Then use whatever you want the next time, try different oils, ride your bike and figure out which one works best for you.

Hi, my name is Andrew. I've been riding bikes for over 15 years. Ever since I rode my first Harley I became in love. If you’re anything like me, then maintaining, tuning and improving your Harley Davidson is all part of the Harley experience. My goal with this blog is to share my experience with and help you discover new and exciting things about your bikes.

1 thought on “What oil should I run in my Harley?”

  1. I have a 1996 Harley soft tail custom. It has 88,000 miles on it. Recently the top end started sounding like a sewing machine. Ratteling like crazy like there is no oil in the top end. It is in both cylinders. I changed the oil and filter and cleaned the tappet screen and replace the oil lines but didn’t help. My oil pressure is 22 psi when warmed up at 2000 rpm. Got any suggestions?

    Reply

Leave a Comment