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Mack · Filtration
25MF436B
In stock · ships from Knoxville
This is a coolant filter (often referenced as a water filter) designed for Mack heavy-duty diesel engines.
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Always verify compatibility with your engine model and check the existing filter dimensions. While primarily used on E6/E9 engines per [nwtruck.com](https://parts.nwtruck.com/part/MF-25MF436), some variations may fit other Mack applications.
Part data verified against 5 catalog sources
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It removes debris, rust, and scale from the cooling system to maintain efficient heat transfer and protect engine components. Many versions contain supplemental coolant additives (SCA) that condition the coolant to prevent liner pitting and corrosion, as confirmed by [dieselpartscenter.com](https://dieselpartscenter.com/products/coolant-filter-genuine-pai-4521) and [duovent.ru](https://duovent.ru/analog/mack-25mf436b/). Replace this filter at the intervals recommended by Mack—typically every 12–24 months or during coolant service—to extend engine life and avoid overheating.
Part Number: 25MF436B
WATER FILTER MACK
Category: Filters
Unit: ea
Dealer: Post Onsite
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