AMSOIL Snowmobile Oil
AMSOIL Shock Therapy Suspension Fluid #5 Light
Formulated for fade-free dampening and smooth rebounds in high-performance applications.
AMSOIL Shock Therapy Suspension Fluids are formulated with shear stable synthetic base stocks with high viscosity indices. The complete additive package reduces foaming, aeration and wear, while seal conditioners are added to keep seals soft and pliable. AMSOIL Shock Therapy Suspension Fluids have been tested and proven to be superior, balanced products recommended for a wide range of temperatures and applications.
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Product Code Pkg./Size
STLQT-EA / Quart Bottle
STLQT-CA / Quart Bottles (case of 12)
STL05-EA / 5-Gallon Pail
STL55-EA / 55-Gallon Drum
Controls Dampening and Rebound
AMSOIL Shock Therapy Suspension Fluids are formulated to make suspension systems more predictable. The base stocks of AMSOIL Shock Therapy Suspension Fluids have inherently high viscosity indices that effectively maintain their viscosities, while their antifoam 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 antiwear agents are added to protect shocks and forks from premature wear.
AMSOIL STL #5 Replaces The Following Lubricants:
Spectro SPL Ultra Light
Ohlins Front Fork #5
Race Tech Light
Klotz 5W
Maxima Shock Fluid
RydeFX
Silkolene Pro RSF
Golden Spectro Very Light
Belray Fork 5W
Bilstein Bilmst 3030
Redline Light
SLP Light
PJ1 Fork Oil
Showa SS05
Belray HVI 5W
AMSOIL STL #5 Is Recommended For Applications Specifying The Following:  Denison HF-0, HF-1, HF-2  Lee Norse 100-1  Ford M6C-32  BF Goodrich 0152 (except PM 500 Series)  Racine Variable Vane Pump  DIN 51524 Part 2  Afnor E 48-603
Recommendations AMSOIL Shock Therapy Suspension Fluids are 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 their suspension systems to 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,® WP® forks, 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,® 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.
TYPICAL TECHNICAL PROPERTIES
AMSOIL SHOCK THERAPY SUSPENSION FLUID STL #5 Light
Kinematic Viscosity @ 100°C, cSt (ASTM D-445)
4.4
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)
15.7
Viscosity Index (ASTM D-2270)
210
Pour Point °C (°F) (ASTM D 97)
-54 [-60]
Flash Point °C (°F) (ASTM D 92)
175 [347]
Fire Point °C (°F) (ASTM D 92)
192 [378]
Four Ball Wear Test (ASTM D-4172: 40kg, 75°C, 1200 rpm, 1 hr) Scar Diameter, mm
0.40
Foam, ml (ASTM D-892) Sequence I, II, III
65/0, 60/0, 65/0
Blender Test (25°C, low speed, 1 min.)
2.5 mins to settle, 8% foam
Controllled Dampening and Rebound
AMSOIL Shock Therapy Suspension Fluid is formulated to make suspension systems more predictable. Its base oils 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.