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 Vietnam.
🏍️ Ride smoother, last longer — Red Line’s clutch oil that means business.
Red Line 42904 V-Twin Primary Case Oil is a premium synthetic oil designed specifically for primary chaincases with wet-diaphragm spring clutches in V-Twin American motorcycles, ATVs, UTVs, and sportbikes from 1984 onward. Its friction-balanced formula enhances clutch operation by reducing slip, wear, and heat, extending clutch lifespan and boosting overall vehicle performance. Trusted since 1979, this 1-quart bottle delivers superior protection and smooth power transfer for serious riders.
| ASIN | B0053O9EUA |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #9,529 in Automotive ( See Top 100 in Automotive ) #157 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 2,721 Reviews |
| 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 |
| Manufacturer | Red Line |
| Manufacturer Part Number | 42904 |
| Model Number | 42904 |
| Package Information | Bottle |
| Part Interchange Info | 42904 |
| Size | 1 Quart |
| UPC | 083522429047 |
| Unit Count | 32.0 Fluid Ounces |
| Vehicle Service Type | Car |
R**P
The best
The best primary oil for all my Harley’s , period .
A**R
Best for wear and tear
This is by far the best primary oil I’ve used in my Harley. I’ve owned a few and have used redline for years.
D**K
Buy this you won’t regret it
Great stuff I always use Red Line products in my 08 Dyna lowrider.
W**D
The best
Only brand I use in all my Harley
K**C
order enough
This item is 32 ounces. You need 38 ounces to fill the primary chaincase on a harley.Make sure you order enough.
S**C
Slick!
Its red. Its liquid. Its slippery. Bike is happy.
G**!
Check the manual
I ordered the case first, it said it had everything WRONG! Harley Davidson is 38 oz not 1 quart. After changing all three fluids I noticed it wasn't enough primary oil. I had to order another quart for just 3 oz I had to wait another week until it finally came. Because Usps said they tried delivering it on Saturday and lied like usual. Saying they couldn't get up my driveway, which I don't have. So far Redline works great thanks. Remember 38oz
R**N
Great service
No issues
B**N
Works well
For 2011 FLHRC. Has made neutral easier to find.
B**G
Redline oil
Great oil for v twins highly recommend .
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
2 weeks ago
1 week ago