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.

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

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.

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.

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42904 V-Twin Primary Oil, 1 Quart, 1 Pack

Product ID: 256579733

Details

Brand
Red Line
Liquid volume
32 Fluid
Package information
Bottle
Vehicle service type
Motorcycle ATV
Viscosity
10W 40

🔥Reduces clutch temperature

⚙️Friction-balanced formula

🏍️Optimized for V-Twin engines

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3537510₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🏍️ Ride smoother, last longer — clutch oil that keeps you ahead of the pack!

TRUSTED LEGACY - From Red Line, a brand synonymous with uncompromising quality since 1979.
PERFORMANCE BOOST - Enhances clutch feel and power delivery, ideal for modified and stock bikes alike.
WIDE COMPATIBILITY - Perfect fit for 1984-to-present V-Twin American motorcycles and aftermarket engines.
EXTENDED CLUTCH LIFESPAN - Reduces wear and heat, keeping your clutch performing longer under pressure.
PRECISION FRICTION BALANCE - Engineered to limit clutch slip for smoother, more responsive operation.

Red Line 42904 V-Twin Primary Oil is a friction-balanced synthetic oil designed specifically for 1984-to-present V-Twin American motorcycle engines. It improves clutch operation by reducing slip, wear, and temperature, extending clutch life and enhancing performance in motorcycles, ATVs, and powersports vehicles with wet-diaphragm spring clutches.

Specifications

ASIN	B0053O9EUA
Best Sellers Rank	#15,354 in Automotive ( See Top 100 in Automotive ) #298 in Automotive Oils
Brand Name	Red Line
Compatible with Vehicle Type	Motorcycle, ATV, UTV
Container Type	Bottle
Customer Reviews	4.8 4.8 out of 5 stars (2,581)
Flash Point	232 Degrees Celsius
Global Trade Identification Number	00083522429047
Included Components	V-Twin Primary Case Oil
Item Type Name	Motor Oils
Item Weight	771 g
Liquid Volume	32 Fluid Ounces
Manufacturer	Red Line
Manufacturer Part Number	42904
UPC	083522429047
Unit Count	32 Milliliters
Viscosity	10W 40

Reviews

B**N

For 2011 FLHRC. Has made neutral easier to find.

11.11.2019

B**G

Great oil for v twins highly recommend .

8.02.2025

A**R

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.

7.03.2026

J**J

Best oil for Harley

14.09.2025

D**K

Great stuff I always use Red Line products in my 08 Dyna lowrider.

29.11.2025

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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