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Red Line

Red Line 42504 20W50 Motorcycle Oil Synthetic - Quart (12 Pack)

  • Based on 650 reviews
Condition: New
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Availability: Only 2 left in stock, order soon!
Fulfilled by AmalTraders
Arrives Monday, Jun 22
Order within 7 hours and 49 minutes
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Size: Quart (12 Pack)


Features

  • 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
  • WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises

Brand: Red Line


Liquid Volume: 32


Package Information: Bottle


Vehicle Service Type: Motorcycle


Automotive Fit Type: Vehicle Specific Fit


Container Type: Bottle


Compatible with Vehicle Type: Motorcycle


Automotive Fit Type: Vehicle Specific Fit


Liquid Volume: 32


Brand Name: Red Line


Manufacturer Part Number: 42504


Manufacturer: Red Line


Size: Quart (12 Pack)


Unit Count: 384.0 Fluid Ounces


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Jun 22

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing 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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