350 – 1000 cSt

Precision Silicone Oil
For Serious RC Tuners.

100% silicone. 14 viscosities from 350 to 1000 cSt. Blended for consistent tuning on real RC rigs — not guesswork.

The Lineup

Find Your Viscosity

These recommendations are starting points. Ideal viscosity depends on vehicle weight, shock and piston design, spring rate, terrain, temperature and driving style.

Lightest350cStLightest damping30wt equivalent

The lightest oil in the lineup. Allows the shock to move most freely with the least resistance — a starting point for setups where lighter damping is desired.

Shop → Light400cStLight damping35wt equivalent

Light damping with faster shock response. Allows the suspension to compress and rebound more freely than mid-range weights.

Shop → Light–Med450cStLight–medium40wt equivalent

A step up from 400 cSt. Adds a bit more resistance while still allowing relatively free shock movement.

Shop → Medium500cStMedium damping45wt equivalent

Mid-range damping. A common starting point for many setups — but the right choice depends on your specific vehicle, shocks, and conditions.

Shop → Med–Heavy550cStMedium–heavy50wt equivalent

Provides more resistance than 500 cSt. Useful when stepping up from a medium baseline to increase damping.

Shop → Heavier600cStHeavier damping55wt equivalent

Slows shock compression and rebound compared to lighter weights. Can help reduce chassis movement in certain setups and conditions.

Shop → Heavy650cStHeavy damping60wt equivalent

Noticeably heavier resistance. A useful step when additional damping is needed beyond the 600 cSt range.

Shop → High700cStHigh damping65wt equivalent

High resistance to shock movement. Slows compression and rebound significantly — useful when a setup calls for greater damping control.

Shop → Very High750cStVery high damping70wt equivalent

Provides very high resistance. A starting point for setups that require substantial damping beyond the mid-range.

Shop → Extra Heavy800cStExtra heavy75wt equivalent

Extra-heavy damping with strong resistance to shock movement. Toward the upper end of the lineup.

Shop → Near Max850cStNear maximum80wt equivalent

Near the top of the range. Provides very high resistance and significantly slows shock movement.

Shop → Very Heavy900cStVery heavy85wt equivalent

Very heavy damping. One of the thickest options in the lineup — for setups where high resistance is specifically needed.

Shop → XT Series950cStXT Series — heavy90wt equivalent

Part of the XT Series. Very high resistance with maximum damping characteristics.

Shop → XT Series1000cStXT Series — maximum95wt equivalent

The thickest oil in the lineup. Maximum resistance to shock movement — the upper limit of the JT's range.

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Not sure which cSt?

We'll help you find the right viscosity for your track and setup.

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Why JT's

Built to Take the Guesswork Out

14 Viscosities

350 to 1000 cSt in 50 cSt steps, so you can actually dial it in instead of settling for close enough.

Full 4 oz Bottles

A full 4 oz (118 mL) in every bottle. No short pours, no paying for headroom.

Precise cSt Ratings

100% silicone, blended and checked batch to batch so 500 always behaves like 500.

Racer Tested

Run on real ARRMA, Traxxas and Losi platforms before it ever reaches a shelf.

In Action

See It in Action

Real RCs. Real testing. Real results. From suspension tuning and maintenance to bashing, jumping and speed runs — this is where we put it to the test.