Twin Big Twin Transmission Oil Big Twin Transmission Oil - 1L
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Description
Big Twin Transmission Oil 85W-140 – Conventional Mineral Gear Oil
Heavy-Duty Protection for Harley-Davidson Big Twin Transmissions
The Big Twin Transmission Oil 85W-140 is engineered specifically for Harley-Davidson Big Twin 4-, 5-, and 6-speed transmissions and final drives that demand extreme durability and smooth performance. Formulated with high-pressure additives and premium base stock, this oil reduces friction, minimizes wear, and delivers smooth, quiet shifting under heavy loads. Its distinctive red color makes leak detection easy while ensuring consistent protection for your transmission gears mile after mile.
Key Features
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Formulated for high-load Big Twin transmissions and gearboxes
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Compatible with 4-, 5-, and 6-speed Harley-Davidson Big Twin transmissions
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Extreme pressure additives protect against metal-to-metal contact and reduce gear wear
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Distinctive red color aids in quick leak detection and easy maintenance checks
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Provides smoother shifts, helping eliminate the common V-Twin “clunk”
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Quiets gear whine for improved riding comfort and transmission longevity
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Enhances wear protection to extend gear and bearing life
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Designed for 4-stroke applications using a conventional mineral base oil
Performance & Fitment
Perfect for Harley-Davidson Big Twin models such as Road Glide, Street Glide, Road King, and Softail with M8 or Twin Cam engines, this 85W-140 transmission oil offers unmatched protection and consistent shifting. It’s the go-to choice for riders who push performance and longevity, whether on long highway rides or daily use. Trusted by builders who demand precision, this oil performs exceptionally well when paired with Nowaskey Suspension and Hofmann Designs performance setups — keeping your drivetrain smooth, cool, and quiet.
Viscosity (Weight): 85W-140
Oil Base: Conventional (Mineral)
Application: 4-Stroke
Container Size: 1.05 US quart / 1 liter
Meets or Exceeds Requirements for: API GL-5
Dispenser Type: Bottle
Units: Each
Weight: 2.08 lbs
Dimensions (L x W x H): 8.26" x 4.68" x 2.55"
Fitment
- Fits Harley-Davidson Softail Models - 2018 to Present
- Fits Harley-Davidson Softail Models - 1984 to 2017
- Fits Harley-Davidson Touring Models
- Fits Harley-Davidson Dyna Models - 1991 to 2017
- Fits Harley-Davidson Sportster Models
- Fits Harley-Davidson FXR Models - 1982 to 1994
- Fits Harley-Davidson Trike Models - 2009 to Present
Not sure it fits your bike? Call 715-235-3659 or chat with us on the site and a tech can confirm it with you.
Specifications & Installation
| Brand | Drag Specialties |
|---|---|
| Part number | 107248 |
| Product type | Transmission Oil |
| Viscosity (Weight) | 85W-140 |
| Oil Base | Conventional (Mineral) |
| Container Size | 1.05 US quart / 1 liter |
| Dispenser Type | Bottle |
| Units | Each |
| Weight | 2.08 lbs |
| Dimensions (L x W x H) | 8.26" x 4.68" x 2.55" |
Videos
Want it installed right? Book the Nowaskey Speed Shop or call 715-235-3659.
Questions Riders Ask
Will this fit my bike?
This part is listed for:
- Fits Harley-Davidson Softail Models - 2018 to Present
- Fits Harley-Davidson Softail Models - 1984 to 2017
- Fits Harley-Davidson Touring Models
- Fits Harley-Davidson Dyna Models - 1991 to 2017
See the Fitment tab for the full list.
Save your bike with Shop by Bike and we check it for you. Not sure? Call or chat with us on the site and a tech can confirm it with you.
What's the part number?
Manufacturer part number 3603-0031. Our item number is 107248.
What do riders buy with this?
Can I install it myself?
Most riders with basic tools and a service manual can. The Specifications & Installation tab lists difficulty, time and guides where we have them. Prefer a pro install? Book a Speed Shop slot and call to check current availability.
Who do I talk to after I buy?
Our techs. Call 715-235-3659 or chat with us on the site and you will reach the people who know these parts.
Still have a question? Call 715-235-3659 or chat with us on the site.
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Premium Performance Parts
Race-proven suspension, front ends and brakes we stand behind
Track-proven Performance
Nowaskey Extreme Performance is a Harley-Davidson suspension and performance shop in Menomonie, Wisconsin. We design our own shocks, fork cartridges and front-end packages, test them in King of the Baggers racing, and back Nowaskey-brand products with a lifetime warranty.
Every setup is matched to your bike, your weight and the way you ride.