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Red Line 42504 20W50 Motorcycle Oil Synthetic - Quart

Based on 674 reviews
Condition: New
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$22.49
Holiday Deal · 85% off was $146.99

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Availability: In Stock.
Fulfilled by Amazon

Arrives Nov 16 – Nov 17
Order within 6 hours and 32 minutes

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At a glance

Condition
New
Size
qt
Model
RED42504
Weight
1.3 lb
Liquid Volume
1 qt
Package Information
Bottle
Vehicle Service Type
ATV, Sport Motorcycle
In the box
Red Line 42504

Features 5

  • DESIGNED FOR - the latest Big-Twin motorcycle engines that specify 20W50 motor oil, including Milwaukee-Eight, Evolution, Twin Cam and aftermarket engines of similar design
  • SUPERIOR FILM STRENGTH - through the use of ester base stocks for protection and ring seal, blended with specific friction modifiers that are compatible with wet-clutches
  • FULL-SYNTHETIC - with PAO and Ester base stocks and 2200 ppm of ZDDP for antiwear
  • POPULAR MOTOR OIL FOR - JASO MA/MA2 applications

Description

Designed for the latest Big-Twin motorcycle engines that specify 20W50 motor oil, including Evolution, Twin Cam, and aftermarket engines of similar design. Redline Motor oils and gear oils are specifically engineered for the latest high-revving four-stroke motocross bikes and ATVs, sportbikes, and V-twins. Each gear oil product reduces the thinning effect from high temperatures. Motor oils are packed with higher levels of anti-wear chemistry like zinc and phosphorus. Special friction modifiers in Red Line motor oils better wet- clutch operation. A variety of Two-Stroke oils to meet the NMMA TC-W3 regulations where required

Specs 21

SAE J300 Viscosity Grade 20W-50
Brand Red Line
Liquid Volume 1 quarts
Package Information Bottle
Vehicle Service Type ATV, Sport Motorcycle
Brand Name Red Line
Manufacturer Part Number 42504
UPC 083522425049

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Nov 16 – Nov 17

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


Red Line Motorcycle oil products
Size: 2 Quarts
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.
Reviewed in the United States on May 20, 2026 by Loucarb

Best oil for big V twins.
Size: Quart
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. ... show more
Reviewed in the United States on March 24, 2019 by mark twain

Great
Size: 2 Quarts
Great for my motorcycle, highly recommend..
Reviewed in the United States on April 26, 2026 by noel eloriaga

Red Line motorcycle oil
Size: Quart
Great oil, better than other.
Reviewed in the United States on June 11, 2026 by Robert Q

Not that it was bad oil, just not worth the extra 3 to ...
Size: Quart
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. ... show more
Reviewed in the United States on September 2, 2017 by C. Motta

Great product
Size: Quart
Great
Reviewed in the United States on April 10, 2026 by Carmen Crisci

Good
Size: Quart
Good
Reviewed in the United States on April 23, 2026 by Fred Lovelace

Performance oil
Size: Quart
Excellent product
Reviewed in the United States on February 7, 2026 by John DiTullio
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