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What type of shock absorber, filled with silicone oil, is standard on hobby-grade RC vehicles?

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Oil-filled shocks use silicone fluid of varying viscosities to dampen suspension movement, and changing the oil weight is one of the most effective tuning adjustments in remote control (Deals) vehicle racing. Thicker oil slows the shock action for smoother surfaces, while thinner oil allows faster compression for rough terrain. Many competitive drivers carry multiple oil weights to their rc car events to adapt to different track conditions.