Genuine OEM Hyundai Oil Level Indicator O-Ring, part number 266152B000. This small but crucial O-ring is designed to create a tight, leak-proof seal for the oil level indicator (dipstick) tube where it enters the engine block or oil pan. Its primary function is to prevent oil leaks from this opening, which helps maintain proper engine oil levels and keeps the engine bay clean. Weighing a mere 0.00046 kg, this O-ring is a precision sealing component. Choosing a genuine OEM O-ring ensures the correct material elasticity, heat resistance, and exact dimensions for a perfect fit, which is essential for preventing oil leaks and ensuring long-term engine reliability.