Benefits & Data

How does SOD-1 affect the base lubricating oil?

In Japan tests on SOD-1 were carried out by Prof. Noriaki Satonaga and Prof. Takashi Watanabe of Sojo University* The effects of adding SOD-1 to base lubricating oil (SN 5W-30) are shown in the table below.

  • Kinematic Viscosity 40C mm2/s improvement rate with SOD-1 27.4%
  • Kinematic Viscosity 100C mm2/s improvement rate with SOD-1 28.6%
  • Rubber Swelling Degree vol.% improvement rate with SOD-1 46.4%

Effects of Reducing Additive on Chemistry of Engine Oil (SN5W-30)

SOD-1 SN5W-30 SN5W-30 + SOD-1 Progress Rate %
Kinematic Viscosity 40˚C mm2/s
Kinematic Viscosity 100˚C mm2/s
 610.0 60.9 77.6 27.4
92.4 10.5  13.5 28.6
Viscosity Index  243 162 179 10.5
FALEX Seizure Load (ASTM) lbs  –  750 1,000 33.3
Hot Tube Test 289˚C Mark  – 7 8 14.3 
Rubber Swelling Degree vol.% 5.6 8.2 46.4

As shown above there is significant improvement in the kinematic viscosity, viscosity index (VI), and rubber swelling once SOD-1 is added to the base oil.

For automatic transmissions Prof. Satonaga and Prof. Watanabe used SOD-1 at 7% volume and performed various tests including a shear stability test. This test evaluates the resistance of oil to a change in viscosity. As mechanical stress or shear increases, the oil loses viscosity or thins out, reducing tribology performance. Kinematic viscosity is the basic measurement used to gauge this, being the time taken for a fluid sample to travel through an orifice in a cappiliary under the force of gravity at given temperatures. The higher the kinematic viscosity the better the oil stands up to stress. The viscosity index (VI) is an arbitrary measure for the change of viscosity with variations in temperature. The higher the VI, the lesser the change of viscosity of the oil meaning better tribology performance.

Effects of Reducing Additive on Chemistry of Engine Oil (SN5W-30)

New Oil (ATF) New Oil (ATF) + SOD-1 (7 vol. %) Progress Rate %
Kinematic Viscosity 40˚C mm2/s  33.7 42.2 25.2
Viscosity Index 7.21 8.96 24.3
FALEX Seizure Load (ASTM) lbs 185 200 8.1
Hot Tube Test 289˚C Mark 1.72 1.48 -14.0 
Rubber Swelling Degree vol.% Seizure 0.46
 Shear Stability (Ultrasonic Method)
 Kinematic Viscosity 40˚C mm2/s (Before Test) 33.6 42.0 25.0
 Kinematic Viscosity 40˚C mm2/s (After Test) 30.8 36.3 17.9
 Rate 40˚C % -8.10 -13.6
 Kinematic Viscosity 100˚C mm2/s (Before Test) 7.21 8.97 24.4
  Kinematic Viscosity 100˚C mm2/s (After Test) 6.50 7.59 16.8
 Rate 100˚C % -9.83 -15.4


* Sojo University in Kumamoto Prefecture is one of Japan’s leading university in aviation ( including the mechanics of jet engines). Prof. Watanabe is also affiliated with Kurume Institute of Technology

Pin It on Pinterest