Millers Classic Shock Oil 46

Heavy ISO 46 / SAE 15 shock absorber and fork oil for competition use

Millers Classic Shock Oil 46 is a heavy SAE 15 shock absorber oil with an ISO 46 viscosity classification, developed for competition-oriented handling.

Millers Oils calls it the heaviest viscosity grade in the Shock Oil series. It can be used neat in shock absorbers and motorcycle forks, and is sold in 1 L bottles.

Key properties

• Grade: ISO 46 / SAE 15, heavy viscosity
• Viscosity: 46 cSt at 40 °C, 8.8 cSt at 100 °C, viscosity index 162
• Specific gravity 0.878 at 15 °C, pour point -28 °C, flash point 218 °C
• Protects against wear, oxidation and corrosion
• Low foaming
• Thermal stability for a longer service life

Choosing the right oil

Choose this grade when you want firmer damping, for competition use or a car or bike that is set up for hard driving. A heavier fluid gives more resistance to movement, so the same shock will feel firmer and slower to react.

That firmness is not always a gain. On a road car with standard springs and dampers, a fluid that is too heavy can make the ride harsh and reduce grip on rough surfaces. If the handbook or the damper builder names a specific viscosity, follow it; if you simply want a sportier feel from a damper that is happy with a medium oil, the Classic Shock Oil 32 may be the better first step.

Drain and refill according to the damper maker's procedure, and use clean containers to avoid contaminating the fluid.