4Fest Detroit 2026
September 18 @ 10:30 am - 3:00 pm
Mill City Synthetics will be at 4Fest in Detroit, MI. 4Fest is one of the premier off-road and Jeep events in the Midwest — a great gathering of enthusiasts, rigs, and trail culture. Stop by and see us — we’ll have AMSOIL products on hand and can spec your Jeep, truck, or powersports equipment on the spot.