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🏍️ Ride smoother, run cooler, and own the road with Red Line Synthetic Power!
Red Line 42504 20W50 Synthetic Motorcycle Oil is a premium, ester-based motor oil designed specifically for modern Big-Twin engines. Featuring a robust 2200 ppm ZDDP antiwear additive and friction modifiers compatible with wet clutches, it ensures superior engine protection, enhanced performance, and smoother throttle response. Trusted by riders since 1979, this quart bottle delivers professional-grade lubrication that keeps your motorcycle running cooler, quieter, and longer.






| ASIN | B003TQ3JQ4 |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #25,475 in Automotive ( See Top 100 in Automotive ) #303 in Motor Oils |
| Brand | Red Line |
| Brand Name | Red Line |
| Compatible with Vehicle Type | ATV, Sport Motorcycle |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 648 Reviews |
| Global Trade Identification Number | 00083522425049 |
| Included Components | Red Line 42504 |
| Item Type Name | Motor Oils |
| Item Weight | 2 Pounds |
| Liquid Volume | 1 Quarts |
| Manufacturer | Red Line |
| Manufacturer Part Number | 42504 |
| Manufacturer Warranty Description | Manufacturer |
| Model Number | RED42504 |
| Package Information | Bottle |
| Size | Quart |
| UPC | 083522425049 |
| Unit Count | 32.0 Ounce |
| Vehicle Service Type | ATV, Sport Motorcycle |
| Viscosity Level | Medium to High |
L**B
Red Line Motorcycle oil products
Best motorcycle oil there is. I stopped using the all everything oil from Harley and Red Line has the 20w50, transmission oil and the main case oil. I have used there product for nine years and love it.
M**N
Best oil for big V twins.
I started changing my own oil a few years back and tried Red Line for no other reason than the reviews. I have 2 bikes with 103s and an older 88. This oil is amazing compared to the garbage HD uses. You will literally hear and feel your motor run better and quieter. No more clunking or lagging with the throttle. It seems to run so much cooler and smoother. You will not be unhappy with this oil. As a side note, I also use Red Line Primare oil and gear oil and notice a huge difference with them as well. Red Line for all 3 holes.
N**A
Great
Great for my motorcycle, highly recommend..
C**I
Great product
Great
C**A
Not that it was bad oil, just not worth the extra 3 to ...
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.
F**E
Good
Good
J**O
Performance oil
Excellent product
C**S
Fast delivery.
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.
S**N
As advertised
As advertised
D**1
huile top qualité pour les gros V2 refroidi par air
huile pour ma mt 01 , réduit fortement le bruit moteur , huile de très bonne qualité , un peu cher , je la recommande
A**R
Bon produit
Satisfaction
T**N
excellent oil
all I use in my bike, switched over to this and the primary and transmission lube. Rating synthetic oil is subjective to say the least. lol. I run it in my roadking and have for several years. works for me.
Trustpilot
5 days ago
4 days ago