Big Boss Dual Oil Cooler for Cummins X15 and ISX 1999-2024

The Big Boss Dual Oil Cooler for Cummins X15 and ISX engines is a high-performance cooling solution engineered to maintain stable oil temperatures and extend engine life. Designed for maximum efficiency, this heavy-duty oil cooler prevents thermal breakdown and keeps operating temperatures closer to the thermostat range, even under demanding load conditions.

Built to outperform standard systems, the Dual Oil Cooler helps eliminate excessive heat buildup—reducing peak oil temperatures that can exceed 255°F in modern engines. Its durable, precision-built construction ensures superior cooling capacity, improved oil stability, and consistent pressure throughout extended hauls and high-power applications.

Perfect for professional operators and performance-focused fleets, the Big Boss Dual Oil Cooler delivers unmatched reliability, long-term durability, and the cooling efficiency needed to keep Cummins engines performing at their best.