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14 viscosities · 2,000–100,000 cSt

Differential Oils

Silicone diff fluids in 14 weights. From 2,000 cSt for free-flowing front diffs to 100,000 cSt for locked-up rear traction. Pure silicone base, heat-stable, made in the UK.

Tuning the diff

The right oil for how the car needs to feel.

Diff oil decides how power gets to the wheels. Too thin and the corner-exit traction goes away. Too thick and the chassis feels locked up, fighting the steering. The trick is the right viscosity for the layout — and getting the same behaviour the next time you fill the diff.

Rhodex covers the working range in 14 weights. Each batch is held to the same tight cSt tolerance, so when you make a change, you're actually changing the oil — not chasing batch variance.

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Rhodex Differential Oils
The full range

14 weights from 2,000 to 100,000 cSt.

From free-flowing front diffs to ultra-thick rear setups — pick the cSt that suits your layout.

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Rhodex 2000 cSt Diff Oil

Differential Performance Fluid

2,000 cSt · Light Flow

Free-flowing diff oil for front differentials in 1/10 touring cars and competition setups.

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Rhodex 3000 cSt Diff Oil

Differential Performance Fluid

3,000 cSt · Light Flow

Light differential fluid for free-rotating front diffs and high-grip surface tuning.

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Rhodex 5000 cSt Diff Oil

Differential Performance Fluid

5,000 cSt · Light Flow

Common viscosity for front diffs in touring cars. Smooth power transfer with predictable corner entry.

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Rhodex 7500 cSt Diff Oil

Differential Performance Fluid

7,500 cSt · Light-Medium

Bridging viscosity between light and medium. Versatile for center diffs and balanced setups.

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Rhodex 10000 cSt Diff Oil

Differential Performance Fluid

10,000 cSt · Medium

Standard center differential viscosity. Reliable choice for balanced 4WD power distribution.

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Rhodex 12500 cSt Diff Oil

Differential Performance Fluid

12,500 cSt · Medium

Mid-range center diff oil. Slight tightening for higher-grip surfaces and corner-exit power.

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Rhodex 15000 cSt Diff Oil

Differential Performance Fluid

15,000 cSt · Medium

Higher-grip center diff viscosity. Used by competitive drivers seeking on-power stability.

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Rhodex 20000 cSt Diff Oil

Differential Performance Fluid

20,000 cSt · Medium-Heavy

Standard rear diff viscosity for off-road buggies. Strong corner-exit traction.

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Rhodex 25000 cSt Diff Oil

Differential Performance Fluid

25,000 cSt · Medium-Heavy

Tighter rear diff for power tracks. More mechanical traction, less unwanted wheel spin.

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Rhodex 30000 cSt Diff Oil

Differential Performance Fluid

30,000 cSt · Heavy

Heavy rear differential fluid. Locked-feeling traction for high-power buggies on grip-rich tracks.

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Rhodex 50000 cSt Diff Oil

Differential Performance Fluid

50,000 cSt · Heavy

Heavy traction control fluid. Near-locked feel for short-course trucks and high-power applications.

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Rhodex 60000 cSt Diff Oil

Differential Performance Fluid

60,000 cSt · Very Heavy

Very heavy diff oil. Specialist viscosity for extreme-traction setups and locked-axle simulation.

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Rhodex 100000 cSt Diff Oil
Ultra-Thick

Differential Performance Fluid

100,000 cSt · Maximum

Maximum viscosity in the range. Ultra-thick fluid for spool-like behavior and extreme traction needs.

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RC buggies cornering on dirt track
Power to the wheels

Corner exit is where the diff oil shows up.

Throttle on, weight shifts, and the diff has to decide how much wheel-to-wheel slip the chassis can use. Too thin, the inside wheel spins. Too thick, the car pushes wide. Right viscosity, right line.

Quick reference

Where to start.

Rough starting points by diff position. Track surface, driving style and chassis all push these around — treat the "common choice" column as a first guess, not a prescription.

Diff Position Typical Range Use Case Common Choice
Front Diff (4WD) 2,000 – 7,500 cSt Free corner entry, light steering response 5,000 cSt
Centre Diff (4WD) 7,500 – 25,000 cSt Front/rear power balance, on-power stability 10,000 cSt
Rear Diff (4WD) 10,000 – 30,000 cSt Corner-exit traction, mechanical grip 20,000 cSt
Single Diff (2WD) 3,000 – 10,000 cSt 2WD buggy traction tuning 5,000 cSt
Locked-Like Setups 50,000 – 100,000 cSt Near-spool behaviour, maximum traction 100,000 cSt

The basic principle

Thicker oil locks the diff up more — more on-power traction, slower direction changes. Thinner oil lets the diff turn more freely — better corner entry, less power down. Pick whichever side of that tradeoff suits your track and driving style.

Get the weight you need

The full range is at Lubricants Hub.

All 14 weights, in stock.

Shop Differential Oils → Selection Guide