Royal Purple Royal Purple #01300 Gear Oil, Max-Gear, Synthetic, 75W90, 1 Quart, Pack of 6. "Max-Gear" from Royal Purple is an ideal gear lube for use in front or rear drive differentials, manual transmissions, or marine gear drives that specify the use of an API GL-5 or GL-4 fluid. It will provide maximum protection for heavily loaded gears and will outperform other gear oils by combining Royal Purple's proprietary "Synslide" additive with the highest quality synthetic oil available. It will help to maximize power and make your differential or gear drive run smoother and quieter. Royal Purple's "Max Gear" will reduce operating temperatures and help your differential go longer between overhauls.Features:* Recommended for use in automotive, RV, and truck front or rear differentials* Provides maximum protection for heavy duty or high performance use* Delivers smoother and quieter operation* Increases time between overhauls* Ideal for use front or rear differentials or marine gear drives* Use anywhere an API GL-5 or GL-4 fluid is recommended* Contains Royal Purple's proprietary "Synslide" additive