Cooling
Fleece Oil Cooler Adapter O-ring Kit (FPE-DMAX-OCADPT-ORING-KIT) for 2001-2016 Duramax LB7 / LLY / LBZ / LML
The Fleece Oil Cooler Adapter O-ring Kit (FPE-DMAX-OCADPT-ORING-KIT) is a durable, OEM-compatible replacement kit by Fleece Performance Engineering, designed for 2001–2016 GM Duramax diesel engines (LB7, LLY, LBZ, LML). It includes all necessary O-rings to reseal the oil cooler adapter, helping prevent oil leaks and maintain engine performance—ideal for routine maintenance or oil cooler servicing.
Sinister Diesel “Welded” Water Pump (SDWWP01) for 2001-2005 Duramax LB7 / LLY
The Sinister Diesel SDWWP01 Welded Water Pump SDWWP01 is a heavy-duty cooling upgrade for 2001-2005 Duramax LB7 and LLY trucks featuring TIG welded impeller and pump gear construction for improved reliability.
Sinister Diesel Radiator Pipe (SDRADTUBEDMAX01) for 2001-2005 Duramax 6.6L LB7 / LLY
The Sinister Diesel Radiator Pipe SDRADTUBEDMAX01 fits 2001-2005 Duramax LB7 and LLY engines. It replaces factory coolant hoses with durable 6061 aluminum construction and four-ply silicone boots. The upgraded design improves cooling system reliability and helps resist cracking over time. Precision mandrel bends provide proper factory-style fitment. The SDRADTUBEDMAX01 also improves engine bay appearance with a Sinister Blue finish.
Sinister Diesel Coolant Reservoir (Degas) Cap (SDDCDMAX01) for 2001-2016 Duramax 6.6L
The Sinister Diesel Coolant Reservoir Cap is a factory-style replacement with a custom design. Made from CNC-machined T6-6061 aluminum, it fits OEM and Sinister Diesel reservoirs for 2001-2016 GM Duramax models. It includes an internal pressure relief system for reliability, even if the gasket fails. Available in gray or Sinister Blue, it combines durability with a stylish look.
Sinister Diesel Coolant Filtration System (SDCOOLFIL6601W) for 2001-2010 Duramax 6.6L LB7 / LLY / LBZ / LMM
This Coolant Filter Bypass System extends the life of your diesel engine by removing contaminants like casting sand and metal shavings, helping to protect the water pump, EGR cooler, and oil cooler. It bypasses and filters small amounts of coolant while the engine runs. The kit includes a CNC-machined billet aluminum filter block that mounts using factory holes, requiring no drilling. It comes with all necessary fittings, and the filter is easy to replace.
Fleece Oil Cooler Adapter (FPE-DMAX-OCADPT) for 2001-2016 Duramax LB7 / LLY / LBZ / LML
The Fleece Performance FPE-DMAX-OCADPT Oil Cooler Adapter is a durable aftermarket upgrade for 2001–2016 GM Duramax diesel engines (LB7, LLY, LBZ, LML). Designed for a direct fit, it improves engine oil cooling for better temperature control under heavy loads or performance use. Ideal for enhancing engine reliability and longevity, it offers a secure, leak-free connection and easy installation for professionals or experienced DIYers.
BD Diesel Xtruded Double-Stacked Auxiliary Trans Cooler Kit 1/2 In Tube (1030606-DS-12) for 1994-2016 Cummins 5.9L / 6.7L & 2001-2016 Duramax LB7 / LLY / LBZ / LMM / LML
The BD Diesel Xtruded Double-Stacked Auxiliary Trans Cooler Kit (1030606-DS-12) is a heavy-duty transmission cooling upgrade for 1994–2016 Cummins and 2001–2016 Duramax diesel engines. Made from durable aluminum with 1/2-inch tubing, its double-stacked, extruded design enhances heat dissipation and airflow, lowering transmission temperatures—especially during towing or hauling. Ideal for diesel truck owners seeking better performance and transmission durability in demanding conditions.
AEM Water Temp Sensor Kit,30-2012, 1/8 in. NPT
The AEM Water Temp Sensor Kit,30-2012, 1/8 in. NPT is a high-quality and reliable product designed to accurately measure the temperature of your vehicle’s coolant system. This kit includes a 1/8 inch NPT sensor, which is a common size used in many vehicles. It also comes with a connector and wiring harness for easy installation. With this sensor kit, you can monitor the temperature of your engine and ensure that it stays within a safe operating range. This is especially important for high-performance vehicles or those used in extreme conditions. The AEM Water Temp Sensor Kit is a must-have for any car enthusiast looking to keep their engine running at its best.
Mishimoto Low Temperature Thermostats – set of 2 (MMTS-CHV-01DL) fits 2001-2016 Duramax 6.6L
The Mishimoto Low Temperature Thermostats are a must-have upgrade for any 2001-2016 Duramax 6.6L owner looking to improve their engine’s performance and longevity. This set of two thermostats, part number MMTS-CHV-01DL, is specifically designed to fit perfectly in your Duramax engine and provide superior cooling capabilities.
Mishimoto Liquid Chill® ( MMRA-LC-5050F) Synthetic Engine Coolant, Premixed 1 Gallon
Liquid Chill Synthetic Engine Coolant (MMRA-LC-5050F) is a premixed solution designed for both diesel and gasoline engines. It uses a nontoxic propylene glycol base with POAT additives for extended service life. This coolant meets ASTM D6210 and ASTM D3306 standards while exceeding stock specifications. It provides protection against extreme temperatures and is safe for all water-cooled engines.
Mishimoto High Temperature Thermostats – set of 2 (MMTS-CHV-01DH) fits 2001-2016 Duramax 6.6L
The Mishimoto High Temperature Thermostats are a must-have upgrade for any 2001-2016 Duramax 6.6L owner looking to improve the performance and reliability of their engine. These thermostats are specifically designed to withstand high temperatures, making them the perfect choice for diesel engines that are known to run hot.
Mishimoto Transmission Cooler (MMTC-DMAX-03SL) fits 2003-2005 Duramax LB7 / LBY 6.6L
The Mishimoto Transmission Cooler (MMTC-DMAX-03SL) is a high-performance cooling solution designed specifically for 2003-2005 Duramax LB7 / LBY 6.6L engines. This powerful transmission cooler is the perfect upgrade for any Duramax owner looking to improve the overall performance and reliability of their vehicle.
Mishimoto Transmission Cooler (MMTC-DMAX-01SL) fits 2001-2003 Duramax LB7 6.6L
The Mishimoto Transmission Cooler (MMTC-DMAX-01SL) is a high-quality aftermarket upgrade designed specifically for 2001-2003 Duramax LB7 6.6L engines. This transmission cooler is a direct-fit replacement for the stock transmission cooler, providing improved cooling efficiency and protection for your vehicle’s transmission.
Mishimoto Liquid Chill® (MMRA-LC-FULLF) Synthetic Engine Coolant, Full Strength 1 Gallon
Mishimoto Liquid Chill (MMRA-LC-FULLF) is a full-strength synthetic engine coolant designed for diesel and gasoline applications. It uses a nontoxic propylene glycol base with POAT additives for extended service life. This coolant meets ASTM D6210 and ASTM D3306 standards. It provides protection against extreme temperatures and is safe for all water-cooled engines.
Mishimoto Transmission Cooler Line Kit (MMTCL-DMAX-01) fits 2001-2005 Duramax 6.6L LB7 / LLY
The Mishimoto MMTCL-DMAX-01 Transmission Cooler Line Kit fits 2001-2005 Duramax LB7 and LLY trucks. It replaces factory lines with braided stainless steel for improved durability. The kit improves fluid flow and cooling efficiency. Includes AN fittings and adapter for easy installation.
