🏁 Ride smoother, last longer — the clutch oil pros swear by!
Red Line 42904 V-Twin Primary Case Oil is a friction-balanced synthetic oil designed specifically for 1984-to-present V-Twin American motorcycle engines and compatible powersports vehicles. It enhances clutch operation by reducing slip, wear, and temperature, extending clutch lifespan while delivering superior performance and protection in wet-diaphragm spring clutch systems.
| ASIN | B0053O9EUA |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #7,315 in Automotive ( See Top 100 in Automotive ) #109 in Motor Oils |
| Brand | Red Line |
| Brand Name | Red Line |
| Compatible with Vehicle Type | Car |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 2,781 Reviews |
| Flash Point | 232 °C |
| 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 |
| Manufacturer | Red Line |
| Manufacturer Part Number | 42904 |
| Model Number | 42904 |
| Number of Packs | 1 |
| Package Information | Bottle |
| Part Interchange Info | 42904 |
| Size | 1 Quart |
| UPC | 083522429047 |
| Unit Count | 32 Fluid Ounces |
| Vehicle Service Type | Car |
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**M
Redlind oils for the win !
Ive tried different oils for my Harley in the past, but have long ago preferred Redline for all 3 holes.
S**N
Primary oil
Fast shipping, good product!
R**P
The best
The best primary oil for all my Harley’s , period .
K**I
The best for my Harley street glide
Red Line bottom line the best for my bikes and high performance vehicles. Removed Willie g derby cover and back to stock while servicing my primary fluid on my street glide. Also used in my 2022 fat boy.
W**S
Fast delivery and worth the money.
Fast delivery and worth the money.
T**N
good value
got this for my 2021 Road Glide Special and so far so good. Red Line has been around a long time & in the racing circle too & i trust this product as much as i trust Harley oil , . Will buy again unless a better product is available at the time i change my primary oil again.
W**D
The best
Only brand I use in all my Harley
B**N
Works well
For 2011 FLHRC. Has made neutral easier to find.
B**G
Redline oil
Great oil for v twins highly recommend .
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.
J**J
Best oil
Best oil for Harley
B**.
WOW!!
Wow!!! Had a bit of noise before but it is practically gone now. Shifting between gears is also smoother!!
Trustpilot
2 days ago
2 months ago