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

The Ultracool M8 Side Mount Oil Cooler works alongside the stock cooler to maintain optimal M8 engine temperatures during traffic and city riding. This side-mount unit features dual thermostatically controlled fans that activate at 210°F and keep oil between 200–230°F, preventing the overheating common to stock cooling systems on Milwaukee-Eight engines.

Features

• Dual-pass aluminum heat exchanger with turbulators
• Thermostat-controlled dual fans (220 CFM) activate at 210°F, shut off at 185°F
• Sealed IP68 waterproof fans with LED indicator light
• Plug-and-play wiring harness with relay and waterproof connectors
• Black nylon-coated stainless steel braided oil lines with AN6 fittings
• Side-mount installation on down tube below engine guard top bar
• Available in gloss black powder coat or chrome grill cover; naked version without cover

Specifications

• Brand: Ultracool
• Manufacturer Part #: SMT8-1G
• Length: 11 in
• Width: 9 in
• Height: 6 in
• Weight: 8 lbs

Fitment

Fits Harley-Davidson Milwaukee-Eight (M8) touring models, 2017–2023, with full-size engine guards. Will not fit models equipped with lower fairings.

Frequently Asked Questions

Will this fit my Touring with lower fairings?

No — this cooler is designed for full-size engine guards only and will not clear a lower fairing.

How does the thermostat work?

A thermal switch automatically turns on the dual fans when oil reaches 210°F. Fans shut off once oil cools to 185°F, keeping temps in the 200–230°F sweet spot.

Is it plug and play?

Yes — the harness connects to the battery under the seat with waterproof connectors. No permanent wiring modifications needed.

Does it replace the stock cooler?

No — it works alongside the stock cooler to enhance overall cooling capacity and prevent overheating in traffic and hot conditions.

What's included?

The cooler unit, dual fans with thermal switch, braided stainless oil lines with AN6 fittings, plug-and-play harness with relay, LED indicator light, oil line fitting wrench, and detailed installation instructions.