Choosing the best oil-filled RC shock absorbers is about more than finding a replacement part. The right shock hardware and silicone fluid combination can improve traction, control chassis movement, and help your vehicle handle jumps, rocks, and uneven terrain more predictably.
This roundup covers compatible 1/10 crawler shock upgrades plus popular silicone shock oils ranging from light 25WT and 30WT fluids to heavier 80WT options. Use the guide below to match shock size, damping, and tuning goals before you buy.
Best 10 Oil Filled Rc Shock Absorbers Picks for 2026
Fine-Tuning Fluid
Team Losi Racing 50WT Silicone Shock Oil
- 50WT, 710CST silicone fluid
- 2-fluid-ounce bottle
- For hobby RC vehicle lubrication
Best For: Medium-viscosity suspension tuning
Aluminum Upgrade
90MM Oil Shock Absorbers for 1/10 Crawlers
- Four 90mm aluminum shocks
- Pre-filled high-viscosity silicone oil
- Adjustable preload collars and hardware
Best For: Compatible 1/10 crawler upgrades
Light-Damping Refill
Team Associated 30Wt Silicone Shock Fluid
- 30Wt, 350 CTS silicone fluid
- 2-fluid-ounce bottle
- Specified for remote control vehicles
Best For: Lower-viscosity RC suspension tuning
Bulk Tuning Oil
Team Losi Racing 40WT Silicone Shock Oil
- 40WT, 516CST silicone fluid
- Larger 4-ounce bottle
- Listed for RC shock absorbers
Best For: Repeated suspension maintenance
OEM 80-Weight Pick
Team Associated 5425 Shock Oil
- 80-weight silicone formula
- 2-ounce replacement bottle
- Check Associated manual for fit
Best For: Select Team Associated vehicles needing 80-weight fluid
Two-Bottle Racing Value
30WT 350CST Silicone Shock Oil
- Two 2-ounce bottles
- 30WT/350CST light damping
- Precision dual-neck bottle design
Best For: 1/10 buggies, small off-road cars, and repeated tuning
40WT Suspension Standard
Team Associated ASC5423 Shock Fluid
- 40WT/500 CST silicone fluid
- 2-ounce bottle
- For RC suspension lubrication
Best For: RC setups specifying medium-weight 40WT or 500 CST fluid
Balanced Tuning
Team Losi Racing 30WT Silicone Shock Oil
- 30WT, 338CST silicone oil
- 4-ounce bottle for repeated servicing
- Designed for RC vehicle parts
Best For: General RC shock maintenance and balanced tuning
Firm Damping
Team Losi Racing 60WT Silicone Shock Oil
- 60WT, 810CST viscosity
- 2-fluid-ounce bottle
- For RC vehicle maintenance
Best For: Heavier damping setups and firm shock tuning
Lightweight Setup
Team Losi Racing 25WT Silicone Shock Oil
- Listed as 25WT and 250CST
- 4-fluid-ounce silicone oil
- For RC maintenance and performance tuning
Best For: Lighter suspension setups, subject to viscosity verification
Fine-Tuning Fluid – Team Losi Racing 50WT Silicone Shock Oil
Team Losi Racing Silicone Shock Oil 50WT 710CST 2OZ TLR74013 Electric Car/Truck Option Parts
Check Price On AmazonTeam Losi Racing 50WT silicone shock oil is a practical choice when you need replacement or tuning fluid for oil filled RC shock absorbers. Its 710CST viscosity and 2-ounce bottle suit hobby RC vehicle maintenance and suspension adjustments.
Best For: RC hobbyists tuning suspension damping with a medium-viscosity silicone fluid.
Pros:
- 50WT, 710CST viscosity is clearly specified.
- Made from silicone for RC vehicle use.
- Compact 2-fluid-ounce bottle is easy to store.
Cons:
- Fluid only; it does not include shock absorbers or hardware.
- One viscosity may not suit every setup.
This is a straightforward refill and tuning option for compatible oil filled RC shock absorbers, especially when you want a clearly identified 50WT fluid in a small bottle.
Aluminum Upgrade – 90MM Oil Shock Absorbers for 1/10 Crawlers
These 90mm oil shock absorbers provide a direct-bolt-on upgrade for selected 1/10 RC crawlers and off-road vehicles. The kit combines aluminum bodies, hardened steel shafts, silicone oil, and adjustable spring preload collars for suspension changes.
Best For: Owners of compatible Tamiya, TRX4, Axial, or D90-style 1/10 RC vehicles seeking a hardware upgrade from stock plastic shocks.
Pros:
- CNC-machined anodized aluminum bodies with hardened steel shafts.
- Pre-filled with high-viscosity silicone oil.
- Adjustable spring preload collars help tune ride height and damping.
- Includes mounting hardware, pivot balls, and spacers.
Cons:
- Compatibility should be confirmed for the specific vehicle before ordering.
- The listed manufacturer warranty is 90 days.
With four shocks in the set and installation hardware included, this is the most complete suspension replacement option here, provided the 90mm length and listed fitment match your RC crawler.
Light-Damping Refill – Team Associated 30Wt Silicone Shock Fluid
Team Associated 30Wt silicone shock fluid is a lower-viscosity refill for compatible oil filled RC shock absorbers. The 350 CTS formula comes in a 2-fluid-ounce bottle and is specified for remote control vehicle use.
Best For: RC users who want a 30-weight silicone fluid for suspension servicing or damping adjustments.
Pros:
- 30Wt viscosity and 350 CTS rating are clearly identified.
- Silicone material is intended for remote control vehicles.
- 2-fluid-ounce bottle provides a practical refill quantity.
Cons:
- Fluid only; no shocks or installation parts are included.
- It has no stated warranty.
- 30Wt may be too light for setups requiring thicker damping oil.
This bottle is a simple choice for replacing or adjusting shock fluid when a 30Wt specification fits your setup; check your vehicle’s recommended viscosity before filling.
Bulk Tuning Oil – Team Losi Racing 40WT Silicone Shock Oil
TEAM LOSI RACING Silicone Shock Oil 40WT 516CST 4OZ TLR74025 Electric Car/Truck Option Parts
Check Price On AmazonTeam Losi Racing 40WT silicone shock oil offers a larger refill volume for maintaining and tuning oil filled RC shock absorbers. Its 516CST viscosity and 4-ounce bottle make it useful when you need more fluid than a standard 2-ounce container.
Best For: RC builders and hobbyists who want a 40WT silicone fluid in a larger bottle for mechanical suspension work.
Pros:
- 40WT, 516CST viscosity is clearly specified.
- 4-ounce volume supports repeated maintenance or multiple shocks.
- Made from silicone and identified as compatible with RC vehicle shock absorbers.
Cons:
- Fluid only; shocks and filling tools are not included.
- 40WT may not match every vehicle’s recommended setup.
Choose this option when you need a medium-weight 40WT fluid and prefer a 4-ounce bottle for ongoing RC suspension servicing rather than a one-time refill.
OEM 80-Weight Pick – Team Associated 5425 Shock Oil
For drivers seeking oil filled RC shock absorbers fluid from a known vehicle-parts brand, Team Associated 5425 provides 80-weight silicone shock oil in a 2-ounce bottle. It is positioned as a replacement part for select Associated vehicles, so verify compatibility in your vehicle’s manual before buying.
Best For: Select Team Associated vehicles needing OEM-style 80-weight replacement shock oil.
Pros:
- Silicone shock oil with an 80-weight viscosity.
- 2-ounce bottle for RC vehicle suspension service.
- Designed as a replacement part for select Associated vehicles.
Cons:
- Compatibility is limited to applicable vehicles; consult the user manual.
- Only one bottle is included.
This is a straightforward OEM-oriented choice when your Associated model specifies 80-weight fluid. Its focused compatibility makes checking the parts listing especially important before purchase.
Two-Bottle Racing Value – 30WT 350CST Silicone Shock Oil
This two-bottle set gives racers a practical way to tune oil filled RC shock absorbers with 30WT, 350CST silicone fluid. The manufacturer positions it for 1/10 buggies and small off-road vehicles, where lighter damping can support flexible handling.
Best For: 1/10 buggies, small off-road RC cars, and drivers who want two bottles for repeated tuning.
Pros:
- Includes two 2-ounce bottles of 30WT 350CST silicone oil.
- Dual-cap design supports controlled filling and sealing.
- Pure silicone formula is described as high-temperature resistant and non-corrosive.
- Includes a viscosity guide for different RC vehicle types.
Cons:
- 30WT is a lighter viscosity and may not suit heavy vehicles or large jumps.
- Vehicle setup still requires draining, cleaning, filling, and bleeding air from the shocks.
With two bottles and a detailed viscosity guide, this set is convenient for regular maintenance and experimentation. Choose it when 30WT damping matches your terrain and chassis rather than treating it as a universal fluid.
40WT Suspension Standard – Team Associated ASC5423 Shock Fluid
Team Associated ASC5423 is a 40WT silicone fluid intended for RC vehicle suspension lubrication. For oil filled RC shock absorbers, its 2-ounce bottle and 500 CST specification make it a practical option when your setup calls for medium-weight damping.
Best For: RC vehicles whose suspension setup specifies Team Associated 40WT or 500 CST silicone shock fluid.
Pros:
- 40WT, 500 CST silicone shock fluid.
- 2-ounce bottle for RC suspension maintenance.
- Specifically listed for remote control vehicle suspension lubrication.
Cons:
- Model compatibility and required viscosity should be confirmed before use.
- Only one listed fluid product is supplied.
ASC5423 is a focused choice for maintaining a setup that calls for 40WT or 500 CST fluid. Its straightforward specification makes it easy to compare against your vehicle’s recommended shock-oil grade.
Balanced Tuning – Team Losi Racing 30WT Silicone Shock Oil
TEAM LOSI RACING Silicone Shock Oil 30WT 338CST 4OZ TLR74023 Electric Car/Truck Option Parts
Check Price On AmazonFor drivers looking to tune oil filled rc shock absorbers, this 30WT silicone oil offers a balanced viscosity for RC car and truck maintenance. The 4-ounce bottle provides a useful supply for servicing shocks and experimenting with suspension setup.
Best For: General RC vehicle maintenance and balanced shock tuning.
Pros:
- 30WT, 338CST silicone formulation
- 4-ounce bottle offers more volume for repeated maintenance
- Made for RC vehicle parts and mechanical use
- Manufactured in the United States
Cons:
- 30WT may not suit setups requiring very light or very heavy damping
- The product notes do not include a dropper or precision applicator
This is a practical middle-viscosity option when you want a larger bottle for routine RC shock servicing. Confirm that 30WT matches your vehicle’s recommended setup before buying.
Firm Damping – Team Losi Racing 60WT Silicone Shock Oil
TEAM LOSI RACING Silicone Shock Oil 60WT 810CST 2OZ TLR74014 Electric Car/Truck Option Parts
Check Price On AmazonWhen tuning oil filled rc shock absorbers for firmer damping, this Team Losi Racing 60WT silicone shock oil is the heavier-viscosity choice in this roundup. Its 810CST formula comes in a compact 2-fluid-ounce bottle for RC vehicle maintenance.
Best For: RC builders seeking a heavier shock-oil viscosity for firm damping setups.
Pros:
- 60WT, 810CST viscosity for heavier damping
- Specified for RC vehicle maintenance
- 450°F upper temperature rating listed in the product details
- Compact 2-fluid-ounce bottle is easy to store
Cons:
- Only 2 fluid ounces are included
- 60WT may be too heavy for setups calling for lighter oil
- The notes describe the item form as gel, despite the product being marketed as shock oil
This option makes the most sense when your setup calls for a 60WT or similarly heavy oil. Check your shock manufacturer’s viscosity recommendations before changing damping levels.
Lightweight Setup – Team Losi Racing 25WT Silicone Shock Oil
TEAM LOSI RACING Silicone Shock Oil 25WT 250CST 4OZ TLR74022 Electric Car/Truck Option Parts
Check Price On AmazonFor a lighter approach to tuning oil filled rc shock absorbers, this Team Losi Racing silicone shock oil is listed as 25WT and 250CST. The 4-fluid-ounce bottle is intended for RC vehicle maintenance and performance adjustments.
Best For: RC users who need a lighter-viscosity oil for suspension setup changes.
Pros:
- Product title identifies a 25WT, 250CST formulation
- Made from silicone for RC applications
- 4-fluid-ounce quantity supports multiple services
- Recommended for RC maintenance and improving performance
Cons:
- Product details also list 40WT, creating a viscosity discrepancy
- Light oil may not provide enough damping for heavier setups
The 25WT/250CST specification makes this attractive for lighter shock tuning, but the conflicting 40WT detail deserves attention. Verify the viscosity on the bottle or with the seller before ordering.
How We Picked the Best Oil Filled Rc Shock Absorbers
We focused on products that support practical RC suspension tuning, including complete 90mm oil shock absorbers for compatible 1/10 crawlers and silicone fluids from Team Losi Racing and Team Associated. The selection spans several viscosity ratings and bottle sizes so beginners can make a basic upgrade while experienced drivers can fine-tune rebound and chassis movement.
Compatibility, fluid consistency, stated viscosity, quantity, and intended use were prioritized. Shock oil is not universal in performance: weight ratings and centistoke measurements can vary by brand, so treat each number as a tuning reference rather than assuming every manufacturer’s rating feels identical.
Quick Comparison
| Option | Best For | Key Consideration |
|---|---|---|
| Complete 90mm oil shocks | 1/10 crawler upgrades | Verify mounting points and travel |
| 25WT–30WT oil | Light damping and rough terrain | More responsive suspension movement |
| 40WT–50WT oil | Balanced everyday tuning | Useful starting range for many vehicles |
| 60WT–80WT oil | Firm control and high-impact driving | Can reduce suspension response if too heavy |
Key Buying Factors for Oil-Filled RC Shock Absorbers
Vehicle Fit and Shock Dimensions
For complete shocks, check eye-to-eye length, shaft diameter, mounting hardware, spring compatibility, and available suspension travel. A 90mm shock may suit a 1/10 crawler but still require different spacers or mounts. Confirm the manufacturer’s compatibility before replacing stock units.
Silicone Oil Weight
Lower-weight oil flows more easily, allowing faster suspension movement and better articulation over small obstacles. Higher-weight oil slows compression and rebound, which can reduce bouncing and chassis movement during landings or aggressive driving. Start near your vehicle manufacturer’s recommended range and change one axle at a time.
Consistency and Volume
Two-ounce bottles work well for routine adjustments, while four-ounce bottles offer better value if you rebuild shocks frequently. Matching oil on both shocks at the same end of the vehicle is essential. Keep bottles sealed and use clean tools to prevent dirt from changing damping performance.
Driving Surface and Setup
Rough crawling often benefits from lighter damping, while jumps, smooth tracks, and heavier vehicles may need thicker oil. Spring rate, piston holes, preload, ride height, and shock orientation also affect results, so oil should be considered part of the entire suspension setup.
Who Should Buy Which Oil Filled Rc Shock Absorbers?
Choose complete 90mm oil shocks if your crawler needs a hardware upgrade and the dimensions match its suspension. Pick 25WT or 30WT fluid for flexible articulation and a lively response. The 40WT or 50WT range is a sensible all-purpose starting point for many trucks and cars. Move to 60WT or 80WT when you need firmer damping for hard landings, fast driving, or a heavier build.
If you are unsure, buy a viscosity close to the current setup, test the vehicle on the same surface, and make small changes. Keeping two neighboring weights on hand makes it easier to tune traction without radically changing the suspension.