A9901870000
Oil Return Line
Detroit Diesel

The oil return line is a critical component that ensures the efficient removal of excess lubricating oil from the engine's upper parts back to the oil pan. Constructed from an aluminum alloy, this line offers a lightweight yet durable pathway that withstands high temperatures and engine vibrations. Its precise dimensions, including a 13.50 mm inner diameter and a 19.50 mm outer diameter, facilitate correct fitment, preventing leaks and ensuring smooth oil flow. The end fittings, with a 16 mm inner diameter and a 24 mm outer diameter, provide secure connections to other components, maintaining a sealed system. This part plays an essential role in maintaining proper oil circulation, which is fundamental for engine cooling and lubrication. Reliable operation of the return line helps prevent oil buildup and contamination, safeguarding engine parts. Source One Parts Center offers quality assurance, making this a reliable choice for engine repair or replacement.