It's not the size but the application. When your coolant heats up it expands and will push coolant into your external tank. When the car cools off it will pull a vacuum on a recovery style tank and keep it topped off to prevent air pockets. The tank pictured is only a catch can. Mine is a quart but I wish it were larger.
Last edited by Vegas69; 12-13-2008 at 11:32 AM.
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