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I upgraded mine from the base to the 'S' oil cooler, so I guess you could call that preventative. I have never seen anyone post online about an oil cooler failure, I'm sure it happens, but it's not common. A much more common issue is when broken water pump impeller bits clog the oil cooler, at which point you would want to replace the oil cooler to make sure those bits don't get any farther into the engine. I have my water pump on a 60-75k preventative replacement schedule, just to be safe.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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