P550777 Donaldson replacement filter

9980005 Oil Filter Paper Core Cross Reference LF777 P550777 9980005 lubrication filter paper core with cross reference numbers LF777 and P550777 is a premium heavy-duty filter insert designed for large commercial trucks and construction machinery diesel engines. Built with multi-layer deep pleated composite filter media, this paper core efficiently traps metal wear shavings, carbon sludge, oil oxidation residues and micro abrasive particles circulating in engine lubricating oil. It maintains consistent smooth oil flow under continuous high-temperature, high-pressure and heavy-load working conditions, effectively reducing friction and wear on crankshaft, bearings, cylinder liners and other core engine components, stabilizing engine power output and cutting excessive fuel consumption. Manufactured strictly to original OEM size standards and fully certified under IATF16949 filtration performance tests, this triple cross-reference filter core delivers long-term reliable engine protection for logistics fleets and mining equipment, lowering engine breakdown frequency and overall vehicle maintenance costs.  Product Material Description: This 9980005 / LF777 / P550777 filter paper core adopts high-density composite cellulose blended with fine glass fiber as primary filtering medium. The filter paper is treated with high-temperature oil-resistant resin impregnation to avoid fiber shedding, softening and swelling after long-term contact with hot engine oil. It is fitted with thick reinforced paper inner support tube to prevent pleat collapse under variable oil pressure, paired with high elastic NBR nitrile rubber sealing gasket with strong anti-aging and oil corrosion performance. All raw materials meet international heavy vehicle filtration standards, featuring uniform fiber distribution, balanced oil permeability and excellent dirt holding capacity.