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Hengst equips US Daimler trucks with new oil-coolant module

Fuel savings and extended service intervals for new heavy-duty diesel engine DD15 Gen5

Münster, 9th June 2021. Apart from being designed to cover extremely long distances, trucks in the United States are also exposed to extreme temperatures. Particularly taxing on the engines in this regard are exceedingly cold temperatures. The latest generation of Daimler's heavy-duty DD15Gen5 engines lives up to these demands by delivering a boost in performance and less downtime. The oil-coolant module from Hengst does its share by providing enhanced filtration properties that result in extended service intervals of up to 150,000 km. What is more, the module also offers an extremely high functional density and brings about significant savings in fuel.


Equipped with an optimized stack filter, the new oil-coolant module engineered by Hengst Filtration is used in a great number of engines, including the engine of the Freightliner Cascadia, which Daimler touts as the top-selling long-distance truck in the United States. The high functional density of the module comprises oil filtration, oil-water-heat management, water pump and, unlike the previous model generation, an oil pressure regulating valve.

Fewer parts, lighter and more robust
By applying smart interface integration, Hengst was able to reduce the number of parts to a minimum. Even the oil thermostat has been incorporated directly into the housing. Overall, the reduction in parts has made the module ten percent lighter than the predecessor model. Better yet, the topology-optimized design provides for greater sturdiness against pressure and pulsation and improves Delta P performance by 30%.

The extremely low temperatures that dominate the winter months in certain parts of North America cause the consistency of the engine oil to turn exceedingly thick and viscous. When it impacts the filter, this highly viscous oil generates an enormous differential pressure (Delta P). The latest generation of the Hengst stack filter has made it possible to achieve a significant increase in oil differential pressure. This causes the filter bypass valve to open later, resulting in a considerable boost in filtration performance.

Improved differential pressure = less fuel and extended service intervals
Hengst has found the solution by developing the stack filter with its partially synthetic medium. Special intermediate plates embedded in the filter insert shorten the pleats, giving a significant boost to stability. At the same time, these plates keep the pleats open, thus keeping differential pressure and filtration performance at optimum levels.

This most recent module generation combines a reduction in fuel consumption with significantly extended service intervals.


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09/13/2022 - 09/17/2022

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Company communication:
Christoph Schings
Telephone: +49 (0)251 20 20 2-0
E-Mail: c.schings(at)hengst.de