Sinclair Synthetic Gear Oils

Industrial Lubricants and Greases

Synthetic Gear Oil

Equipment designs from OEMs continue to change, and industrial operating conditions are getting more and more severe, with increased demands on power density and other stress-increasing factors. Those issues are compounded by demands for more power output from smaller equipment and the need for industrial lubricants that can perform in challenging conditions. Sinclair synthetic gear oils have kept up with those changes, and give you the protection, toughness, and endurance you need.

Sinclair Synthetic Gear Oils: Performance You'll Notice

Sinclair Synthetic Gear Oils are specifically engineered and formulated to give you:


Sinclair has broadened their line of full synthetic lubricants to protect your equipment even under high loads, pressures, varying ranges of operating temperatures, and threats of contamination.

With Sinclair, you’re getting lubricants that outperform their conventional counterparts, giving your equipment extended life while also increasing worker safety through reduced maintenance.


Sinclair full synthetic gear oils provide exceptional control of wear and friction via a chemical formulation that causes molecules to bond, forming a barrier-building shield.


Get outstanding protection in the most arduous climates, pressures and power densities to protect against oxidation, micro pitting, separation of air and water, or shrinking dump sizes.

Typical Properties

Viscosity Grade 75W-90 Full Syn
Brookfield Viscosity at -40°C, cP ASTM D2983 135,000
Color ASTM D1500 1
Flash Point °C ASTM D92 224
Flash Point °F ASTM D92 435
Gravity, °API ASTM D287 31.24
Pour Point °C (°F) ASTM D5950 -51°C (-60°F)
Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.8695
Viscosity @ 100°C cSt ASTM D445 16.15
Viscosity @ 40°C cSt ASTM D445 109.3
Viscosity Index ASTM D2270 159

Industry/OEM Approvals

Title 75W-90 Full Syn
AGMA 9005-E02, 250.03, 250.04, 251.02, No. 4 Meets Requirements
AIST/US Steel 224 Meets Requirements
API GL-5 Meets Requirements
ArvinMeritor (Rockwell International) 076-E Meets Requirements
GM 9986115 Suitable for Use
Limited Slip Suitable for Use
Mack GO-J, GO-H, GO-G Meets Requirements
MT-1 Meets Requirements
SAE J2360, MIL-2105E/F Meets Requirements