Ultracool M8 Naked Oil Cooler - Harley Milwaukee-Eight
About Ultracool
Ultracool parts and accessories are stocked at Vtwinbikers for Harley-Davidson and Indian Motorcycle applications. Every Ultracool item we list is new and sourced through authorized distribution. If you are not certain a part matches your year and model, use Shop by Bike or email our team before you order and we will confirm fitment first.
The Ultracool M8 Naked Oil Cooler provides crucial auxiliary cooling for 2017-2023 Harley Milwaukee-Eight engines. Designed to work in tandem with your factory cooler, this side-mount system is engineered to prevent overheating, especially during stop-and-go traffic and city riding. It ensures your engine oil stays within the optimal temperature range for peak performance and longevity.
Why riders pick this
- Auxiliary cooling for Milwaukee-Eight engines
- Works with factory cooler to prevent overheating
- Dual-fan aluminum heat exchanger with automatic thermal control
- Maintains optimal oil temperature range
- Side-mount "naked" design for a clean look
- Plug-and-play wiring for easy installation
Harley-Davidson Milwaukee-Eight engines, especially in demanding conditions, can benefit significantly from enhanced cooling. The Ultracool M8 Naked Oil Cooler addresses this need by introducing a robust secondary cooling circuit. Its dual-fan aluminum heat exchanger, equipped with an automatic thermal switch, maintains engine oil in the ideal 200–230°F range, safeguarding your engine from the damaging effects of excessive heat.
Advanced Engine Temperature Management
- Side-mount design on the down tube for a clean, uncovered look
- Dual-pass aluminum heat exchanger with turbulators for superior cooling efficiency
- Sealed IP68 waterproof dual fans generate 220 CFM airflow
- Automatic thermal switch activates fans at 210°F and deactivates them at 185°F
- Plug-and-play wiring harness with relay and waterproof connectors for easy installation
- Black nylon-coated stainless steel braided oil lines with AN6 fittings ensure durability
Reliable Performance, Clean Aesthetic
This Ultracool M8 Naked Oil Cooler is engineered for riders who prioritize performance and a minimalist aesthetic. Its "naked" design means no external cover, showcasing the quality components while providing maximum airflow. The self-contained system with an LED indicator light keeps you informed of its operation, making it a smart and effective upgrade for any Milwaukee-Eight powered Harley-Davidson, working alongside your factory setup to manage full-engine oil circulation.
Specifications
- Brand: UltraCool
- Manufacturer Part #: SMT8-3
- Length: 11 in
- Width: 9 in
- Height: 6 in
- Weight: 8 lbs
Common questions
Why would I need this if my M8 already has an oil cooler?
Your M8's factory oil cooler is designed for general conditions, but heavy traffic, high ambient temperatures, or aggressive riding can push it past its limits. The Ultracool M8 Naked Oil Cooler adds an auxiliary, fan-assisted cooling circuit to ensure your oil temperatures remain optimal in all situations, extending engine life and maintaining performance.
Does this cooler require any modifications to my engine or frame?
The Ultracool M8 Naked Oil Cooler is designed for a side-mount installation on the down tube and features a plug-and-play wiring harness. It integrates with your existing system, minimizing the need for extensive modifications.
How do I know if the fans are working?
This Ultracool M8 Naked Oil Cooler includes an LED indicator light that illuminates when the dual fans are actively engaged and running, providing a visual confirmation of its operation.
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.
| BRAND | Ultracool |
| TYPE | Engine |
| SKU | 56-7211 |
| WEIGHT | 8.0 lb |
