Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart

Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart

Q: What color is the fluid?

The primary case fluid is amber colored. You may be thinking about the Heavy Shockproof Transmission fluid which is pink.

Q: Can this be used in a can am outlander atv?

this is for a wet clutch where the transmission and primary do not share the same fluid

Q: Any compatibility issues removing amsoil from primary and replacing with red line?

Don't know I was running HD primary oil but I don't think there would be any issues it doesn't circulate through the engine or tranny.

Q: What computer part on my Harley-Davidson can I put on and hook up to the computer to get in more rapid response from my throttle

You need a tuner from Harley, or another maker,TTS3 , etc. and program to be able to talk to your CPU . The connection is under my seat,it differs with year and model bike.

Product ID: 3747152

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Details

Viscosity
75W/80W/75W80
Brand
Red Line
Liquid Volume
32 Fluid
Package Information
Bottle
Vehicle Service Type
Car

🔥232°C flash point ensures high-heat stability

⚙️75W/80W SAE viscosity for optimal clutch performance

🏍️Universal fit for 1984+ V-Twin American motorcycle engines

Frequently Bought Together

Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart

Red Line 42804 V-Twin Transmission Oil with Shockproof - 4 Quarts

K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils: Fits Select Harely Davidson Motorcycles, KN-171B

Description

🏁 Ride smoother, last longer — Red Line’s clutch oil keeps you ahead of the pack!

PROVEN LEGACY - Trusted since 1979, Red Line guarantees uncompromising quality and protection
PERFORMANCE BOOSTER - Enhances clutch response while reducing wear and operating temperature
EXTENDED CLUTCH LIFE - Formulated to maximize clutch lifespan, keeping your ride ready for the long haul
VERSATILE COMPATIBILITY - Perfectly suited for motorcycles, ATVs, UTVs, and powersports with wet-diaphragm clutches
FRICTION BALANCED FORMULA - Engineered to limit clutch slip and deliver smooth, precise operation

Red Line 42904 V-Twin Primary Case Oil is a high-performance synthetic oil designed specifically for 1984 and newer V-Twin American motorcycle engines, including Evolution and Twin Cam models. Its friction-balanced formula optimizes clutch operation by reducing slip and wear, while its high flash point ensures stability under extreme heat. Ideal for motorcycles, ATVs, and UTVs with wet-diaphragm spring clutches, this 1-quart oil enhances vehicle performance and extends clutch life, backed by Red Line’s trusted expertise since 1979.

Specifications

Viscosity	75W/80W/75W80 sae_grade
Brand	Red Line
Vehicle Service Type	Car
Flash Point	232 Degrees Celsius
UPC	083522429047
Automotive Fit Type	Universal Fit
Global Trade Identification Number	00083522429047
Manufacturer	Red Line
Size	1 Quart
Model	42904
Item Weight	0.634 ounces
Product Dimensions	3.9 x 4.9 x 9 inches
Item model number	42904
Is Discontinued By Manufacturer	No
Exterior	Painted
Manufacturer Part Number	42904
OEM Part Number	42904

Have a Question? See What Others Asked

What color is the fluid?

Can this be used in a can am outlander atv?

Any compatibility issues removing amsoil from primary and replacing with red line?

What computer part on my Harley-Davidson can I put on and hook up to the computer to get in more rapid response from my throttle

Reviews

S**S

Harley Transmission runs smooth

My got to oil for my Harley. Quality you can count on.

10.07.2025

G**E

Redline Chaincase Oil

Great Primary Chaincase Oil

24.07.2025

B**N

Recommended

It’s redline. Works great. What else is there to say?

12.06.2025

H**W

Redline products ROCK!

Redline lubricants excel in all motorsports. From the aftermarket 6 speed trans & factory wet clutch primary in my '96 Harley Davidson EVO Softail to the Tremec T-56 Magnum 6 speed and 8.8 Traclok rear in my '85 S10 Blazer I trust Redline products, you should too!

13.06.2025

E**N

Huge Upgrade - Much Smoother

Bought this to change my primary oil in a 08 FXDL. I was having trouble at times shifting into 1st especially when cold. Only had the bike for a couple months so figured the easiest "fix" to try first would be the oil change. What a huge difference!! Shifting into first is no longer a problem even when the engine is cold, smoother shifts throught and now I can easily find the elusive "N" on the first try!!!!Give Redline a try, hopefully you will have as great an experience as I did!

15.08.2024

T**N

Perfect

Great product and cheaper than in local stores. Quick delivery.

11.06.2025

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

14.05.2024

I**

Just what I wanted

Exactly what I thought

25.07.2025

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