HMTG021 PREMIUM GEAR OIL SAE 90 is a monograde gear oil for use where a non-EP lubricant is required. It is blended from carefully selected highly refined paraffinic base oils which exhibit superior oxidation stability and excellent rust protection. Commonly used in older vehicles where sensitive metals may be present. API GL-1. Always refer to the manufacturers handbook before use. Performance levels can be subject to change. Technical Datasheets available upon request.