Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.
Desertcart purchases this item on your behalf and handles shipping, customs, and support to Macau.
🏍️ Elevate your ride with clutch-perfect power — don’t let your V-Twin settle for less!
Red Line's V-Twin Primary Case Oil is a full-synthetic, friction-balanced lubricant designed specifically for 1984 and newer American V-Twin motorcycle engines. It optimizes clutch operation by reducing slip and wear, performs reliably across a wide temperature range with a 232°C flash point, and is trusted by racers since 1979. Ideal for wet-diaphragm spring clutches, this oil enhances power delivery and quiets mechanical noise, making it the go-to choice for serious riders seeking peak performance and engine longevity.
| ASIN | B0053O9EUA |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | 249,143 in Automotive ( See Top 100 in Automotive ) 1,682 in Car Engine Oils |
| Brand | Red Line |
| Brand Name | Red Line |
| Compatible with Vehicle Type | Motorcycle |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 2,480 Reviews |
| Flash Point | 232 Degrees Celsius |
| Flash point | 232 Degrees Celsius |
| Global Trade Identification Number | 00083522429047 |
| Included Components | Red Line (42904) V-Twin Primary Case Oil - Engine Oil (1 Quart Bottle) |
| Item Type Name | Motor Oils |
| Item Weight | 1.7 Pounds |
| Liquid Volume | 32 Fluid Ounces |
| Liquid volume | 32 Fluid Ounces |
| Manufacturer | Red Line |
| Manufacturer Part Number | 42904 |
| Model Number | 42904 |
| Package information | Bottle |
| Part Interchange Info | 42904 |
| Size | 1 Quart |
| UPC | 083522429047 |
| Unit Count | 946.3529 millilitre |
| Vehicle service type | Motorcycle |
F**1
Top notch oil
Probably the best primary fluid around. Clutch engages smoothly, and really quiets the mechanical noise. A note of caution when ordering. As others have noted, ckeck the amount of oil your specific bike needs. Several reviewers have models requiring 38 ounces. I’ve attaced a pic from my owners manual on a 2024 Streetglide with a Gen 2 M8. 34 ounces if filling from dry, 30 ounces if a wet refill. I assume the Gen 1 M8’s are the same. Can’t remember what it was on a Twin Cam.
B**N
Works well
For 2011 FLHRC. Has made neutral easier to find.
J**J
Best oil
Best oil for Harley
C**E
As advertised.
As advertised.
M**S
Put it to the test
Performed an oil change prior to a 4600 km road trip. This bike was new to me and therefore wanted my first trip with new oil. Went through some extreme temperatures on the trip and no issues to report. Good products.
Trustpilot
4 days ago
2 weeks ago