King Engine Bearings MB4521AM0.25 Main Bearing Set Oversize Mercedes-Benz - 0.25mm M272

The King Engine Bearings MB4521AM0.25 is an OE-replacement main bearing set designed for Mercedes-Benz M272.911 and M272.920 engines. This AM-Series bearing set features King's standard aluminum-based bi-metal material, the softest in their range, making it ideal for passenger car engines with low to medium loads.

Key Features:

• 4-pair main bearing set in 0.25mm oversize
• Lead-free aluminum-based bi-metal construction
• Superior embeddability to reduce scratching of crankshaft journals and protect bearing overlays
• Precision tolerance control up to +/- .0001 inch
• Environmentally safe, lead-free composite material
• Recommended for street and marine applications

The AM-Series employs King's K-783 standard aluminum-based material, equivalent to SAE-783 specifications, specifically engineered for OE replacement applications in low and medium load engines. King Engine Bearings has specialized in engine bearings since 1960, building an extensive product offering for automobiles, trucks, marine, aviation, and other internal combustion engines.