anyone try this in their primary?

I have on my last 2 bikes. I like it.

Do i use this for a Harley Sporster?

Yes, I prefer it over the oil harley uses in gear box. Thicker and smooths out shifts. IMO

Can I use this in an open differential in my car? It calls for sae 75-140.

If it’s the same weight as what your car call for I would assume, or send a message to Lucas oil and they could clarify wether or not it’s recommended

The gear oil has very little, if any color. I use Lucas products in all my vehicles, (Harleys, SUV, and pickup). Outstanding product.

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10791 Synthetic SAE 75W-140 V-Twin Gear Oil - 1 Quart

10791 Synthetic SAE 75W-140 V-Twin Gear Oil - 1 Quart

Product ID: 13288239

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Details

Material
Blend
Brand
Lucas Oil
Package Information
Bottle
Liquid Volume
1 Quarts
Item Weight
16 Ounces

🔥High-temp stability for horsepower beasts

⚙️75W-140 viscosity for extreme protection

❄️Synthetic base oils for cool, quiet rides

Description

⚙️ Ride harder, shift smoother — never settle for less!

COOL QUIET OPERATION - Keeps your gearbox running smoothly with reduced noise and heat buildup.
SUPERIOR SYNTHETIC BLEND - Premium synthetic base oils plus Lucas additives ensure max wear protection and minimal drag.
TRUSTED BRAND RELIABILITY - Lucas Oil’s proven formula means your bike’s transmission is in expert hands.
HIGH TEMPERATURE DURABILITY - Stands strong under intense heat and horsepower demands without breaking down.
ENGINEERED FOR V TWINS HIGH PERFORMANCE TRANSMISSIONS - Tailored to handle the torque and heat of your powerhouse ride.

Lucas Oil 10791 Synthetic SAE 75W-140 V-Twin Gear Oil is a premium synthetic blend designed specifically for V-Twin motorcycles and high-performance transmissions. It offers superior wear protection, reduces drag, and maintains cool, quiet operation even under high horsepower and temperature conditions, ensuring your ride performs at its peak.

Specifications

Material	Blend
Brand	Lucas Oil
Package Information	Bottle
Liquid Volume	1 Quarts
Item Weight	16 Ounces
Recommended Uses For Product	Automotive
Viscosity	75W-140
Specific Uses For Product	Motorcycle gearboxes, high-performance transmissions
Item Form	Oil
Global Trade Identification Number	00049807107918
Manufacturer	Lucas Oil
Unit Count	128.0 Fluid Ounces
UPC	049807407919
Number of Items	1
Model	10791
Item Weight	1 pounds
Product Dimensions	9 x 4.35 x 2.42 inches
Item model number	10791
Is Discontinued By Manufacturer	No
Manufacturer Part Number	LUCA10791
OEM Part Number	10791

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