✓ VERIFIED
Apr 6, 2022
Bel Ray is awesome
Great stuff !!! I run this in both my Harleys and have better cooling and better shifts then with any other fluid
BEL-RAY
SKU: 840-1579
Bel-Ray Primary Chaincase Lubricant - V-Twin Chaincase Lube 6gal BIB — Harley-Davidson (1955-2026)
$281.95
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Bel-Ray primary chaincase lubricant is a specialized oil formulated for V-twin motorcycle primary cases and wet clutches. This 6-gallon bulk container delivers wear protection, prevents clutch slip and chatter, and features a distinctive red color for easy leak spotting.
Features
- Formulated for primary chaincase and wet clutches
- Extends primary chain life with anti-wear additives
- Prevents clutch slipping and chatter
- Distinctive red color for leak detection
- Suitable for Big Twin air-cooled and liquid-cooled engines
- 6-gallon bulk bag-in-box (BIB) format
Specifications
- Brand: Bel-Ray
- Manufacturer Part #: 301830150033
- UPC: 690509408539
- Container Size: 6 gallons
- Container Type: Bag-in-box (BIB)
- Weight: 45 lbs
- Dimensions: 18 in L × 7 in W × 13 in H
Fitment
Fits V-twin motorcycles with primary chaincase and wet clutch systems, including Harley-Davidson Big Twin air-cooled and liquid-cooled models.
Frequently Asked Questions
Is this oil suitable for both air-cooled and liquid-cooled Big Twins?
Yes — Bel-Ray primary chaincase lube works in both air-cooled and liquid-cooled Big Twin primary cases.
How often should I change primary chaincase oil?
Follow your motorcycle's service manual, typically every 10,000–20,000 miles depending on riding conditions and engine type.
Why is the oil red?
The distinctive red color helps you spot leaks from the primary case quickly, making maintenance easier.
What's the advantage of a 6-gallon BIB container?
Bulk format reduces cost per gallon and is ideal for shops, fleets, or riders maintaining multiple bikes. Dispense as needed without wasting in smaller bottles.
Can I use this in the transmission or rear differential?
No — this oil is formulated specifically for primary chaincase and wet clutch systems. Use the manufacturer's recommended fluid for transmission and final drive.
| BRAND | Bel-Ray |
| TYPE | Chemicals |
| SKU | 840-1579 |
| WEIGHT | 45.0 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.83
59 RATINGS
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✓ VERIFIED
Jun 16, 2025
EVERYTHING is Better With Bel-Ray!
I been changing my own Harley Fluids almost 30 years! I changed my Harley bikes to Bel-Ray a few years back, I'm now Bel-Ray in my Trans, Primary and engine oil from my Classic EVO to my modern M8 . <br />The Bel-Ray products improved everything from offering the lowest top end valve noise using the Motor Oil to less 1st gear clunk and smooth like BUTTER shifting to NOW SUPER EASY finding Neutral. Everything is better with Bel-Ray my now #1 Fluids of choice from my Classic to modern Harley!
✓ VERIFIED
Apr 7, 2026
Quality Harley fluids
Works great in my '95 Heritage Softail. Great feel and runs a quiet primary. Excellent stuff.
✓ VERIFIED
Nov 5, 2025
All i use
Been using it for years
✓ VERIFIED
Oct 3, 2025
Excellent fluids
I love these Belray fluids for the primary specific oil and the transmission specific oil engine oil run whatever you want but for the primary and transmission fluid made by Belray I feel it is very good fluid as the bike shifts smoother doesn't clunk near as hard when you drop it in first gear. I've been running this stuff for years and years and I've never had any primary or transmission issues
✓ VERIFIED
Oct 3, 2025
Instantly had an easier time finding neutral along with the shifts feeling incredibly smooth
