This ELRING valve stem seal, part number 393.890, is engineered to provide a reliable seal for your engine's valve stems. Its primary function is to prevent oil from entering the combustion chamber, which helps to reduce oil consumption and exhaust smoke. Crafted from durable materials, this seal is built to withstand the high temperatures and pressures found within the engine. Proper installation ensures optimal engine function and longevity. Replacing worn or damaged valve stem seals is crucial for maintaining engine health and performance. This component plays a vital role in the overall efficiency and reliability of your vehicle's engine.