Available for: 1999-2026 Cummins X15 and ISX Engines

Key Benefits

• Dual high efficiency cooler packs
• 75% more oil cooling capacity
• Lowers peak oil temperature 20-30 degrees
• Thermostat and bypass valve included
• Complete new casting and assembly
• Made in the USA

Warranty: 1 Year Unlimited Mileage Warranty

Introducing the Big Boss Performance Dual Oil Cooler for Cummins X15 and ISX Engines, the ultimate solution for keeping your engine's oil cool and preventing the oil from breaking down prematurely.

Most drivers have noticed with newer engines that peak oil temperatures can reach 255 degrees and higher. We have addressed this issue with our new Dual Oil Cooler, which can keep your operating temps closer to the thermostat temperature. 

Designed with a robust construction, the Performance Oil Cooler is built to withstand the toughest conditions and keep your engine running cool. With its innovative design, this oil cooler is guaranteed to deliver top performance, reliability, and durability.

OEM Reference Part Number

4386026, 4386025, 4386199, 4955831, 4965896, 4089583, 4965906, 4965895, 4955830, 3682787, 3682788, 4920199, 5394142, 4952498