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Royal Purple Synthetic Motor Oil

Royal Purple Max-Gear Synthetic Gear Oil

Buy Royal Purple® Max-Gear Online

Beyond Synthetic™

Max-Gear® 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.
Max-Gear® is an ultra-tough, high performance, GL-5 automotive gear oil designed to provide maximum protection to heavily loaded gears while maximizing power throughput through the drive train. It outperforms other GL-5 gear oils because it combines the highest quality synthetic oils with Royal Purple's proprietary Synslide® additive technology. Max-Gear® makes gears run smoother, quieter, cooler and longer without overhauls.

Synslide® additive technology makes the difference!

Synthetic oils enable Royal Purple to make superior lubricants, but it is Royal Purple's advanced Synslide® additive technology that gives Royal Purple's EP lubricants their amazing performance advantages. Synslide® additive technology truly is beyond synthetic.™

Synslide® additive technology, Royal Purple's tough, EP lubricating film, provides maximum protection under boundary lubrication conditions typically caused by heavily loaded, slow speed and / or shock load conditions. This tenacious, slippery film significantly improves lubrication and reduces wear by increasing the oil film thickness and toughness, which helps to prevent metal-to-metal contact in gears and bearings.

Synslide® additive technology is noncorrosive to gears and bearings, including case-hardened gears that are easily pitted by conventional sulfur-phosphorus EP oils. Synslide® additive technology displaces water from metal surfaces and excels in protecting equipment in wet environments. It also fortifies the oil against the detrimental effects of heat, which causes oil to oxidize.

Max-Gear® Exclusive Performance Advantages:

  • Severe Service Performance
    Max-Gear® exceeds Eaton's stringent GL-5 / MIL-L-2105D Gear Oil Specs. Max-Gear® also is safe for GL-4 applications or bronze synchro gears.
  • Lower Coefficient of Friction
    Max-Gear® saves energy, reduces temperatures and maximizes power throughput. (OEM or aftermarket limited slip additives are not required.)
  • High Temperature Performance
    Max-Gear® eliminates harmful deposits and extends oil drain intervals. Low Temperature Fluidity
    Max-Gear® meets operating requirements for vehicles operating in cold climates.
  • Shock Load Protection
    Max-Gear® reduces fatigue failures in bearings and gears.
  • Prevents Corrosion
    Max-Gear® protects both ferrous and nonferrous metals during operation and shutdown.
  • Excellent Water Separation
    Max-Gear® completely separates from water, preventing an oil-water emulsion.
  • Compatible with Other Oils
    Max-Gear® is compatible with other mineral gears oils and other synthetic hydrocarbon gear
  • Meets Warranty Requirements
    Max-Gear® exceeds OEM warranty requirements for GL-5 automotive rear axle hypoid gear lubrication.
  • Environmentally Responsible
    Max-Gear® components are TSCA listed and meet EPA, RCRA and OSHA requirements. Max-Gear® extends oil drain intervals, eliminates premature oil changes, decreases the amount of oil purchased and disposed of and conserves energy.

Royal Purple Max-Gear Synthetic Gear Oil

Standard Packaging:

75W90, 75W140, 80W90, 85W140

  • 12 1-Quart Bottles / Case*
  • 5-Gallon Pail
  • 15-Gallon Drum
  • 55-Gallon Drum

*Available in cases only.

80W90, SAE 90

  • 5-Gallon Pail
  • 55-Gallon Drum

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Nish Motorsports 14 National and World Land Speed Rcords

Team: Nish Motorsports

Drivers: Terry, Mike, Jeff & T.J. Nish

Crew Chief: Cec McCray

Car: Streamliner

Engine / Fuel: V8 674 cu. in. / 30% Nitro Methane / Alcohol

Induction: Natural Aspiration

Hometown: Salt Lake City, UT

14 National and World Land Speed Records

Engine >> Royal Purple® Racing 41
Rear >> Royal Purple® Max-Gear® 75W90