Fastrax Racing Pure Silicone Oil 15wt FAST60-15 125cst 50ml bottle Lubrication

Additional Information - the wt/cst that appears first is the accurate one and the others have been converted using the cst=(wtx15)-100 guide.

Fastrax Racing Pure Silicone Oil 15Wt FAST60-15

RC Shock Oil – Setup & Selection Guide

Note: A full table of available shock oil viscosities and part numbers can be found at the end of this listing.

Pure silicone shock oil for RC cars
Suitable for use in on-road and off-road vehicles.

How Shock Oil Affects Handling

• Thinner oil (lower cSt / WT)
  Softer damping → more weight transfer, better traction, quicker response. May increase chassis roll.

• Thicker oil (higher cSt / WT)
  Firmer damping → slower weight transfer, stiffer chassis, more stable on high-traction surfaces. May reduce grip in low-traction conditions.

Choosing Shock Oil

Factors affecting your choice:

• Vehicle type (on-road vs off-road)

• Car weight

• Spring stiffness

• Shock size and piston holes

Always start with manufacturer-recommended “box stock” settings before fine-tuning.

cSt Calculation from WT

To convert from WT to approximate cSt:

cSt ≈ (WT × 15) − 100
(≈ indicates approximate)

Example: 35 WT → cSt ≈ (35 × 15) − 100 = 425 cSt

For consistency, use oils from the same brand.

Recommended Shock Oil Setups

1:10 Touring Car 4WD

Front & Rear: 350 – 500 cSt (≈ 30 – 40 WT)

Suggested part numbers: FAST60-30, FAST60-35, FAST60-40, FAST60-45

Thinner oils → smoother cornering with quicker weight transfer
Thicker oils → more stability and slower roll

1:10 Buggy / Short Course 2WD

Front: 300 – 350 cSt (≈ 25 – 30 WT)
Rear: 250 – 350 cSt (≈ 20 – 30 WT)

Suggested part numbers: FAST60-25, FAST60-30, FAST60-35

Thinner oils → better grip on low-traction tracks
Thicker oils → sharper steering, more stable rear

1:10 Buggy 4WD

Front: 350 – 450 cSt (≈ 30 – 35 WT)
Rear: 300 – 400 cSt (≈ 25 – 35 WT)

Suggested part numbers: FAST60-30, FAST60-35, FAST60-40

Low-traction tracks → use thinner oil
High-traction tracks → use thicker oil

1:10 Short Course 4WD

Front: 350 – 450 cSt (≈ 30 – 35 WT)
Rear: 350 – 400 cSt (≈ 30 – 35 WT)

Suggested part numbers: FAST60-30, FAST60-35, FAST60-40

Rear damping is generally softer for improved traction
Monitor landings to prevent bounce

1:8 Buggy & Truggy

Front: 400 – 600 cSt (≈ 35 – 50 WT)
Rear: 350 – 500 cSt (≈ 30 – 40 WT)

Suggested part numbers: FAST60-35, FAST60-40, FAST60-45, FAST60-50

Heavy vehicles → front damping may need to be stiffer to prevent dive
Rear damping → softer for better turn-in grip

Fastrax Pure Silicone Shock Oil Range (FAST60)

cSt calculated using: cSt ≈ (WT × 15) − 100 (≈ approximate)

Final Note

Shock tuning is highly track- and driver-dependent. These recommended oils are starting points — small changes in viscosity can noticeably alter vehicle handling.