Genuine Donaldson P550866 Coolant Filter | Spin-On SCA Plus for Cummins & International

Keep your commercial diesel engine running at peak thermal efficiency with this Genuine Donaldson P550866 Coolant Filter (Spin-On SCA Plus). Engineered explicitly for heavy-duty cooling loops—including Cummins Extended Life Coolant systems—this premium filter utilizes high-efficiency synthetic media to capture rust, scale, and particulate debris before it can compromise your water pump or block core passages.

Equipped with built-in Supplemental Coolant Additives (SCA Plus), this filter slowly releases crucial chemical protectants into your fluid system. This prevents liner pitting, cavitation erosion, and internal corrosion, drastically extending engine life and avoiding catastrophic roadside failures.

⚙️ Product & Engineering Specifications

• Brand / Manufacturer: Donaldson Filtration Solutions
• Part Number: P550866
• Style: Heavy-Duty Spin-On Fluid Filter
• Media Type: Advanced Synthetic Fiber
• Thread Size: M36 x 2
• Filter Outer Diameter: 3.66 Inches (93 mm)
• Filter Length: 5.79 Inches (147 mm)
• Performance Rating: 99% Efficiency at 50 Microns (SAE J1985 Standard)

🔄 Industry Interchanges & Cross-References

This heavy-duty coolant filter directly replaces or interchanges with the following part numbers:

• Cummins: 3100310, 3680315, 3680433, 4907485
• Fleetguard: WF2125, WF2126
• Baldwin: BW5086
• Wix: 24111, 24112
• Alliance Parts: ABPN10GWF2125, ABPN10GWF2126
• Luber-Finer: LFW2125, LFW2126, LWF2126
• Carquest / NAPA: 89111, 89112 / 4111, 4112

🚚 Common Fleet & Vehicle Applications

• International (Navistar): 9900i series and heavy conventional cabs
• Freightliner: 114SD and severe-duty vocational configurations
• Kenworth / Peterbilt: T700, C500, 378, 379, 385 commercial chassis
• Mack Trucks: CL series and associated heavy hauling rigs