1 Quart - Nitro Lubricants 75w-90 GL-5 gear oil is a fully synthetic gear oil that provides premium protection under severe conditions. This oil has multi-grade characteristics and is recommended for hypoid gears in moderate and severe service, including shock-loading, and some manual transmissions. It is also a heavy-duty, severe-service 500,000-mile drain capable. This 75w-90 GL-5 oil is formulated with limited-slip additives that meet the performance specifications for service fill limited slip applications.