Red Line 42504 20W50 Motorcycle Oil Synthetic - Quart

Fast delivery. This is great oil. It stays relatively clean even when running hard in high dust conditions. Knowing that this oil does well in high temp enviroments, give me some peace of mind when stuck in traffic on a hot summer day. I run it is a '23 Lowrider ST.

The best for a Harley!

Great motorcycle oil. It shifts and runs much better - quieter & smoother.

Works great in my Harley

Good stuff

Absolutely love this fluid. I give it 4 stars because there is no sight level on the bottle. It’s conpletely black. So when doing my oil change which requires an initial fill of 2.5 quarts I have to guess how much is a half quart on the third bottle. Add a clear stripe like literally every manufacturer does to their bottles so we can see the level remaining in the bottle please!!

good stuff, i’ve used them all, this juice keeps the hog running cooler on those hot days. i highly recommend the redline shockproof trans juice as well.

I've been using this oil in my 2005 Buell XB12 for over nine years. I started out with the Harley branded synthetic oil. Then I learned that Harley just rebranded a blended oil from a big-name manufacturer. Not that it was bad oil, just not worth the extra 3 to 4 dollars over mobile one or Castrol V-twin oil. The thing about red line is it is a pure synthetic. Does it make a difference for a regular street bike, I can't really say. The Bull engine is air cooled and runs really hot, especially here in the south. Getting stuck in summer afternoon traffic on the highway is absolute murder. I also like to run the occasional track day, just for fun. After all these years and at about 50,000 miles The bike still runs like new. I opened up the engine to add some hotter cams... and I was surprised to see almost no wear on any metal surfaces. I can't say the redline does something that other oils don't.... but I can't say that it has done an amazing job in my engine.