NEO Synthetics 75W90RHD Gear Oil

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NEO Synthetics

NEO Synthetic racing heavy duty gear oil is designed to take 40% more load carrying capabilities than it's competitors. NEO heavy duty gear oils are compounded with the most recently developed additive system to provide the ultimate in gear protection and is available in quart or gallon bottles


  • 75W90RHD gear oil synthetic base heavy duty
  • Reduces friction
  • Runs cooler
  • Increases fuel mileage
  • Superior film strength
  • Extends gear life
  • Eases cold temperature shifting
  • Extended service life

Reduced Friction: NEO synthetic gear oil has an extremely low coefficient of friction, which means cooler running gear boxes. The reduced friction aand cooler running combine to extend gear box life, and also the life of the lubricant.

High Load Capacity: The high film shear strength allows the gear lube to perform far beyond the capabilities of petroleum products in hypoid differentials and other gear boxes. An anti-foaming additive assures that the film strength will not be compromised.

Easier Cold Weather Shifting: The lower pour point temperature of the synthetic means better operation at lower temperatures, and better protection for gears and bearings upon initial startup at the lower temperature.

Corrosion Resistance: The synthetic base stock does not break down into unwanted components and form corrosive compounds under the stress of high heat. The additive package works synergistically with the synthetic base to provide further corrosion protection.

Seal Compatibility: The NEO synthetic base stock increases seal life. It will not cause excessive seal swelling, nor will it cause seals to shrink or harden.

NEO Gear Oil exceeds the requirements of auto specs GL-2 thru GL-5 and military specification MIL-L-2105E. It is ideally suited for autos and trucks requiring this viscosity grade to these specifications.
NEO meets the requirements for GL-4 grade even where manufacturers discourage the use of a GL-5 product. It is recommended for front wheel drive transaxle use where GL-4 performance is specified.
Common vehicle drive train components needing the NEO Gear Oils are manual transmissions, drive axles, differentials (including limited slip differentials), transaxles, auxiliary transmissions, transfer cases, overdrives and final drives.
Industrial equipment applications for NEO Gear Oils include gear boxes for conveyors and similar assembly line drives. Gear boxes using this type of lubricant typically do not need any break-in period on petroleum lubricants. The NEO Gear Oil can be used as a direct replacement at anytime.
NEO Gear Oil will mix with petroleum products; it is not necessary to flush the gear box first, however, mixing a large amount of petroleum with NEO synthetic will reduce the qualities of the NEO and will shorten the service life, this is not recommended.

Using aftermarket additives is not necessary and may product unpredictable results. Use of aftermarket additives voids the NEO warranty.


  • NEO gear oils meet and exceeds requirements for Auto Spec GL-2 through GL-5 and meets military specifications MIL-L-2105E
  • Caution: Use the viscosity grade recommended by the manufacturer for the expected environment
  • Specification for 75W140RHD


  • Viscosity index 180
  • Kinematic at 212F 25.3 cSt
  • Flash point 475F
  • Pour point 45F
  • Viscosity at 100 degree C cST (SUS) 15.4
  • Specific gravity 15.6 degree C (60 degree F) 0.87
  • 7-day moisture corrosion (L-33) PASS
  • API GL-5 test sequence PASS
  • Mil-L-2105 C test sequence PASS

Subject to normal manufacturing tolerances. NEO Synthetics gear lubricant is race-proven too not only at Indy but at endurance competitions all over the world.

The fact is no conventional gear lube can perform as well as NEOs Synthetics.

P65 Warning
 "WARNING: This product contains a chemical known to the State of California to cause cancer and/or birth defects or other reproductive harm.