This document provides information on GulfSea BD Gear Oils, a line of environmentally friendly marine gear oils developed for use in sensitive marine environments. The oils are biodegradable, minimally toxic, and meet the definition of an Environmentally Acceptable Lubricant. They offer benefits such as a wide operating temperature range, compatibility with common seals, and excellent water separation properties. The oils are suitable for use in marine thrusters and certain CPP applications where oil leakage could impact the environment. Typical properties of the BD 68, BD 100, and BD 150 variants are provided.