Ultracool M8 Side Mount Oil Cooler - Softail `2017-2023 Gloss BLK

Ultracool M8 Side Mount oil cooler for 2017-2023 Harley Softail with Milwaukee-Eight engine, engineered to work alongside the stock cooler to keep oil temps in the optimal 200-230°F range during traffic and city riding. Dual sealed fans kick in automatically at 210°F and include a plug-and-play wiring harness with waterproof connectors for straightforward battery installation.

Features

• Dual-pass aluminum heat exchanger with turbulators
• Sealed waterproof IP68 dual fans produce 220 CFM airflow
• Automatic thermal switch activates fans at 210°F, deactivates at 185°F
• Plug-and-play wiring harness with relay and waterproof connectors
• Black nylon coated stainless steel braided oil lines with AN6 fittings
• LED indicator light shows when fans are operating
• Mounts on down tube just below top bar of full-size engine guards
• Chrome or powder-coated black grill cover included

Specifications

• Brand: Ultracool
• Manufacturer Part #: SMS8-1G
• Length: 11 in
• Width: 9 in
• Height: 6 in
• Weight: 8 lbs

Fitment

Fits 2017-2023 Harley-Davidson Softail models with Milwaukee-Eight (M8) oil-cooled engines and full-size engine guards. Will NOT fit models with lower fairing.

Frequently Asked Questions

Will this fit my Softail with lower fairing?

No — this cooler is designed only for models with full-size engine guards and will not clear lower fairings.

Do I need to remove the stock oil cooler?

No — the Ultracool side mount works in conjunction with the factory cooler to maximize heat dissipation across both units.

How hard is the installation?

Straightforward: the wiring harness plugs into the battery under the seat, and oil lines connect via included AN6 fittings. Special wrench and detailed instructions are provided.

When do the fans turn on?

Fans automatically activate when oil reaches 210°F and shut off once cooled to 185°F, keeping oil in the optimal 200-230°F operating window.

What's included in the box?

Oil cooler with grill cover, dual fans, thermal switch with waterproof connectors, plug-and-play wiring harness with relay, braided oil lines, LED indicator light, fitting wrench, and instructions.