Engine lubrication plays a critical role in protecting internal components from friction, excessive heat, and premature wear. When evaluating a replacement engine, buyers should look beyond its exterior condition and consider whether essential lubrication components are functioning correctly. One often-overlooked part is the engine oil filter bypass valve, which helps maintain oil cir... https://usedenginepart.com/how-oil-filter-bypass-valve-inspection-helps-assess-replacement-engine-protection-in-2026/