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Hi Graeme, Nothing unusual about that in old cars in cold weather, like we are experiencing her in S.E. Qld. at present. I gather you are Buccan, near Chamber Fat etc. (I live at Greenbank) The last two mornings have been the coldest two mornings in the past 2 years. What happens I think, is that as the hot moist air inside the "exhaust system" cools overnight, after a run; that moisture condenses to water, & mixes & dissolves with the carbon in the exhaust system. Start it up on a cold morning; give it a couple of short burst of revs to clear the cobwebs, and instead of cobwebs, you get a black sootie water vapour. This is there all the time, but not in the initial volume you cop, when you first start your car, and blow it out. With the car warm after a run, let it idle, and briefly hold a clean white rag over the end of the exhaust pipe & you'll see what I mean. Sounds like you better get your girl to open the Rolladoor, before starting it up these mornings. Look on the good side; your girl could have backed the car into the garage, then you'd have a Gyprock wall speckled with black soot, which is not as easy to clean as a rolladoor ! P.S. Glad to see I'm not the only one to lay old carpet on the garage floor. Cheers Banjo.