narrow-range oil

Narrow-range oil:Narrow-range oil is a type of motor oil that is designed for use in engines with very tight tolerances. It is made from highly refined base oils and contains additives that help protect engine parts from wear and tear. Narrow-range oil is often used in high-performance engines or engines that operate under extreme conditions. It is also used in engines that require special oils due to their design or location (such as aircraft engines).