🏍️ Ride smoother, last longer — clutch oil that means business!
Red Line 42904 V-Twin Primary Oil is a friction-balanced synthetic oil designed specifically for 1984 and newer V-Twin American motorcycle engines. It enhances clutch operation by reducing slip and temperature, extending clutch lifespan while ensuring smooth power delivery. Compatible with wet-diaphragm spring clutches in motorcycles, ATVs, and powersports vehicles, this 1-quart bottle delivers proven performance trusted by enthusiasts since 1979.
| ASIN | B0053O9EUA |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #33,255 in Automotive ( See Top 100 in Automotive ) #471 in Automotive Oils |
| Brand | Red Line |
| Brand Name | Red Line |
| Compatible with Vehicle Type | Motorcycle, ATV, UTV |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 2,675 Reviews |
| Flash Point | 232 Degrees Celsius |
| Flash point | 232 Degrees Celsius |
| Global Trade Identification Number | 00083522429047 |
| Included Components | V-Twin Primary Case Oil |
| 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 |
| Number of Packs | 1 |
| Package information | Bottle |
| Part Interchange Info | 42904 |
| SAE J300 Viscosity Grade | 10W-40 |
| Size | 1 Quart |
| UPC | 083522429047 |
| Unit Count | 32 Milliliters |
| Vehicle service type | Motorcycle, ATV, UTV |
H**O
TLC for your V-Twin
Best synthetic oil for your V-Twin if your engine is modified (big bore build, or camshaft, etc.). High performance engines put off more heat and this oil is hands down the best I've used thus far to aid with the high heat matter. I use this oil in the summer/high heat seasons and then use AMSOIL for winter storage/minimal riding, just the engine oil. I keep my primary and transmission filled with Red Line all year round. For context, I ride a 2020 Road Glide Limited and live in Northern Virgina by Shenandoah.
B**N
Works well
For 2011 FLHRC. Has made neutral easier to find.
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.
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.
J**J
Best oil
Best oil for Harley
Trustpilot
2 weeks ago
2 months ago