BEL-RAY SKU: 840-1583

Bel-Ray Big Twin Transmission Oil 85W140 6 Gallon BIB - Harley & Indian V-Twin

$281.95
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About Bel-Ray

Bel-Ray has manufactured motorcycle lubricants since 1948, with V-twin specific engine, primary and transmission oils formulated for air-cooled operating temperatures.

Bel-Ray Big Twin Transmission Oil 85W140 is a full synthetic gear oil formulated for Harley-Davidson and Indian Motorcycle transmissions and final drives with separate lubrication systems. It delivers robust wear protection, reduces gear noise, and significantly improves shift quality in both air-cooled and liquid-cooled Big Twin engines.

Why riders pick this

  • Full synthetic 85W140 gear oil for V-twin transmissions
  • Meets API GL-5 specification for severe duty
  • Extends gear life through advanced wear protection
  • Reduces gear noise for a quieter ride
  • Improves shifting smoothness and precision

Your V-twin's transmission works hard, and Bel-Ray Big Twin Transmission Oil is designed to meet that challenge head-on. This full synthetic 85W140 gear oil provides exceptional lubrication and cushioning for gears, minimizing wear and extending the life of your transmission components. Riders will notice smoother, more precise shifts and a reduction in annoying gear whine, enhancing the overall riding experience.

Superior Protection for Your Drivetrain

  • Formulated specifically for separate transmission and final drive systems
  • Meets the demanding API GL-5 specification for gear oils
  • Robust wear protection extends the life of your gears
  • Reduces gear whine for a quieter ride
  • Improves shifting smoothness and precision

Bulk Supply for Enthusiasts and Shops

Offered in a convenient 6-gallon bag-in-box (BIB) format, this transmission oil is perfect for riders who perform regular maintenance or for shops servicing multiple Harley-Davidson and Indian Motorcycle Big Twin models. Having a bulk supply ensures you're always prepared for transmission fluid changes, keeping your V-twin's drivetrain in optimal condition with Bel-Ray's proven performance.

Specifications

  • Brand: Bel-Ray
  • Manufacturer Part #: 301828150033
  • UPC: 690509408522
  • Viscosity: 85w140
  • Volume: 6 gallons BIB (Bag-in-Box)
  • Weight: 45 lbs
  • Dimensions: 18 in L x 7 in W x 13 in H

Common questions

Is this transmission oil suitable for both Harley-Davidson and Indian Motorcycle Big Twins?

Yes, Bel-Ray Big Twin Transmission Oil 85W140 is formulated for V-twin motorcycles with separate transmission and final drive lubrication systems, including Harley-Davidson and Indian Motorcycle Big Twin models.

What does API GL-5 mean for transmission oil?

API GL-5 is the American Petroleum Institute's highest gear oil specification, indicating it's formulated for high-pressure differentials and demanding gear train applications, offering superior protection against wear.

Will this oil help with noisy shifting or gear whine?

Yes, this transmission oil is specifically designed to reduce gear whine and improve shifting smoothness, contributing to a quieter and more refined riding experience.

Ordering from Vtwinbikers

  • Brand new, sourced through authorized US distribution — never used, never grey-market.
  • Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
  • Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
BRANDBel-Ray
TYPEChemicals
SKU840-1583
WEIGHT45.0 lb
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.93
76 RATINGS
5★ 72
4★ 3
3★ 1
2★ 0
1★ 0
✓ VERIFIED
Jul 25, 2023

Bel-Ray big Twin oil for the win

Will not use OEM oil after buying Bel-Ray, this oil makes it very easy to find neutral, shifting seems smoother and less “clunky” sounding. It’s all I will be using from now on.

— DANIEL N
✓ VERIFIED
Nov 22, 2022

Bel-Ray is all I use in my Harley primary & trans. I’ve tried many and bel-ray makes shifting and finding neutral a piece of cake

— Anonymous
✓ VERIFIED
Sep 2, 2022

Bel-Ray transmission oil works great and allows very smooth and quiet shifting without the notorious Harley clunk.

— Anonymous
✓ VERIFIED
Jun 8, 2022

I have tried several different transmission fluids throughout the years for my Harleys and I think Bel-Ray is the best. It doesn't take out all the noise when shifting but it is the quitest of anything I have tried.

— Anonymous
✓ VERIFIED
May 31, 2021

Transmission shifts smoother now!

— Anonymous
✓ VERIFIED
Apr 14, 2021

used some on my wife she loved it.<br />need more for the bike though

— Anonymous