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Yeah, I've had a pinhole leak in the radiator in my '04 S. Been driving around with it for almost 5 years now. Done driving schools and trips to Florida with it. I just top it off once in a while. It still holds some pressure and if I leave the cap not fully tightened I don't have to add as often.
I took my 2011 MC in for a water leak at the connection of the water hose to the thermostat housing. The hose with the water leak was replaced with a hose that is part of the coolant temperature sensor recall. The cooling system was pressure checked and I have not lost any coolant in about 400 miles after this work. My coolant level stayed at the high mark in the overflow tank before the leak occurred.