Speak with an Expert
Free* Shipping on Orders Over $159
Easy 30 Days- No Hassle Returns
37,000+ 5 Star Reviews
MFG Fitment Guarantee
Couldn't load pickup availability
Red Line 42504 20W‑50 Full Synthetic Motorcycle Oil – 1 Quart
High-Performance Ester/PAO Blend – Provided by Elite Race Fab
Red Line 42504 is a heavy-duty 20W‑50 synthetic motorcycle oil designed for modern and classic V‑Twin engines. Built on a superior Ester/PAO synthetic base with high ZDDP anti-wear additives, it offers maximum engine protection, smooth clutch performance, and long drain intervals — even under high heat and load.
Key Benefits:
High film strength for excellent wear protection
Smooth wet-clutch compatibility and gear protection
Superior thermal stability and oxidation resistance
Enhanced detergency for cleaner engine internals
Excellent cold-start lubrication with strong high-temp performance
Specifications:
SAE Grade: 20W‑50
Size: 1 Quart (946 mL)
Base: Ester & Polyalphaolefin (PAO)
ZDDP Level: ~2200 ppm Zinc/Phosphorus
Intended Use: 4-cycle motorcycle engines with integrated or separate transmissions and clutches
Fitment / Recommended Use:
Perfect for:
Harley-Davidson Milwaukee-Eight, Twin Cam, and Evolution motors
V‑Twin touring and cruiser bikes
Air-cooled or high-load motorcycle engines
Applications requiring smooth clutch operation and high-temp durability
Why Buy From Elite Race Fab?
Trusted by serious riders and mechanics
Fast shipping and performance-focused support
No gimmicks — just real protection and performance
We are open Monday-Friday from 8am-6pm EST
Yes, customers located in and around the the Piedmont area are welcome to pick up their items from our retail location during normal business hours. Our address is:
Elite Race Fab
1514 Holbrook St Suite D-F
Greensboro, NC 27403
Elite Race Fab offers free ground shipping & handling to our retail customers within the lower 48 contiguous United States on most orders totaling $159.99 and higher, when the item being purchased is not a Freight/LTL item! Orders under $159.99 will be subject to a nominal $13.99 Flat shipping charge. Some exceptions and/or exclusions apply, in those scenarios you will be advised of any additional charges in the item details/description stating shipping exclussions/freight shipping required etc.
In regards to expedited and international shipping each order will need to be quoted on a case by case basis. You can obtain a quote two ways:
- From your shopping cart select "Request a Quote" prior to placing your order. We will review your proposed order and promptly respond with shipping estimates.
- Complete your order ahead of time indicating either expedited or international shipping during the checkout process. We will promptly determine shipping rates for your order and email you for approval and additional payment.
-Give us a call and we can ensure your item is shipped right then, to ensure you have it in time for your deadline.
We have been committed to offering all of our customers the lowest pricing throughout our website day in and day out. We value your business so much that we go a step further than our competitors. We use a third party software that proactively monitors all our competitor's websites/pricing so that we can make adjustments accordingly if needed to have the lowest prices. Thats right, no need to spend hours searching for the lowest prices, as ours will be the lowest.
As far as price matching, we dont want to write a check we cant cash, but we certainly want to earn your business. With that said, we will go above and beyond to match our competitor's pricing when it is needed. Simply email us, click the live contact button, or give us a call and be sure to have a link to our competitor's site and please factor in any shipping and handling their website will be charging. We will then ensure you get the lowest price, and either match or beat their pricing.
Unable to find satisfactory answers ?
