Duralec™ Gear Oil HD
Maximum Protection and Power Heavy Duty Gear Oil
Duralec Gear Oil HD is an ultra-tough, high performance automotive gear oil designed to provide maximum protection to heavily loaded gears while maximizing power throughout the drive train.
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Duralec Gear Oil HD outperforms ordinary gear oils by combining the highest quality synthetic oils with Royal Purple’s proprietary Synerlec® additive technology. Duralec Gear Oil HD makes gears run smoother, quieter, cooler and longer without overhauls.
Duralec Gear Oil HD is recommended for use in truck and automotive front or rear differentials, manual transmissions and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid. It is non-corrosive to soft yellow metals (brass, bronze, copper, etc.) and synchronizer safe.