Shock Therapy Suspension Fluid #5 Light

Shock Therapy Suspension Fluid #5 Light Formulated for fade-free dampening and smooth rebounds in high-performance applications Controls friction, heat, wear, foaming and scuffing in suspension components. High viscosity index and shear-stability controls shock fade and inconsistent dampening in temperature extremes.

SKU: STL Categories: ,

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AMSOIL Shock Therapy Suspension Fluid is formulated with shear-stable synthetic base stocks with high viscosity indices. Its complete additive package reduces foaming, aeration and wear, while seal conditioners are added to keep seals soft and pliable. AMSOIL Shock Therapy Suspension Fluid has been tested and proven to be a superior, balanced product recommended for a wide range of temperatures and applications.

Shock Therapy Suspension Fluid #5 LightControllled Dampening and Rebound

AMSOIL Shock Therapy Suspension Fluid is formulated to make suspension systems more predictable. Its base stocks have inherently high viscosity indices that effectively maintain viscosity, while its anti-foam agents reduce aeration and foam.

Reduces Friction and Wear

The constant friction within a shock body decreases suspension performance. AMSOIL Shock Therapy Suspension Fluid contains friction modifiers to reduce the energy loss caused by friction, while anti-wear agents are added to protect shocks and forks from premature wear.

AMSOIL STL #5 Replaces The Following Lubricants:

Spectro SPL Ultra LightOhlins Front Fork #5
Race Tech LightKlotz 5W
Maxima Shock FluidRydeFX
Silkolene Pro RSFGolden Spectro Very Light
Belray Fork 5WBilstein Bilmst 3030
Redline LightSLP Light
PJ1 Fork OilShowa SS05
Belray HVI 5W

AMSOIL STL #5 Is Recommended For Applications Specifying The Following:

  • Denison HF-0, HF-1, HF-2
  • Racine Variable Vane Pump
  • Lee Norse 100-1
  • DIN 51524 Part 2
  • Ford M6C-32
  • Afnor E 48-603
  • BF Goodrich 0152 (except PM 500 Series)


AMSOIL Shock Therapy Suspension Fluid is recommended for front forks and shocks on snowmobiles, motocross and cruiser motorcycles, ATVs and other racing and recreational use vehicles, as well as cars and trucks that require suspension systems that perform in the most extreme conditions. It is recommended the fluid be agitated before use.

AMSOIL Shock Therapy Suspension Fluid is available in two different viscosities. AMSOIL Shock Therapy Suspension Fluid Light #5 (STL) is recommended for, but not limited to, Showa®, Kayaba®, Bilstein®, RydeFX®, Penske® and WP® forks; and RACETECH® (US1) and Custom Axis® suspension systems. Use Shock Therapy Light #5 where less dampening and quicker rebounds are desired. It is also the preferred choice for winter use.

AMSOIL Shock Therapy Suspension Fluid Medium #10 (STM) is recommended for, but not limited to, Ohlin®, FOX®, RACETECH® (US2), Koni® and WP® shocks; and Harley-Davidson® forks that recommend type “E” or “B” fork oil. Use Shock Therapy Medium #10 where more dampening control and slower rebounds are desired.

Product Availability

AMSOIL Shock Therapy Suspension Fluids are available in quarts and 5-gallon pails.

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AMSOIL products are backed by a Limited Liability Warranty. For complete information visit


This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Safety Data Sheet (SDS). An SDS is available online at or upon request at 715-392-7101. Keep Out Of Reach Of Children. Recycle used oil and bottle.


Kinematic Viscosity @ 100°C, cSt (ASTM D445) 4.4
Kinematic Viscosity @ 40°C, cSt (ASTM D445) 15.9
Viscosity Index (ASTM D2270) 209
Pour Point °C (°F) (ASTM D97)-53 [-63.4]
Flash Point °C (°F) (ASTM D92) 174 [345.2]
Fire Point °C (°F) (ASTM D92)192 [378]
Four-Ball Wear Test @ 40 kgf, 75ºC,
1200 rpm, 1 hr, scar diameter, mm (ASTM D4172)
Foam, ml (ASTM D892) Sequence I, II, III65/0, 60/0, 65/0
Blender Test (25°C, low speed, 1 min.)2.5 mins to settle,
8% foam

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