http://www.monroe.com/tech_support/tec_shockabsorbers.asp

Actually the main reason for gas inside the shock absorber is to help prevent bubbles from forming in the oil. If the gas leaks out, the shock will still have resistance, so the car actually won't be 'bouncy'. But, if the 'oil' leaks out, the car will be bouncy on that corner.

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1990 300CE. Garage kept all its life. Looks & Runs Like New. Everything works. White w/Palomino int. Pioneer 12 CD player in the boot. 17" Enkei LX-F Chrome wheels w/Falken Azenis ST-115 225-45 tires. Tinted windows. Black sports grill w/Euro clear front lamps.