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I would suspect that you're actually leaking "soot". If the engine is running reasonably well and you're getting black liquid when the engine is cold, it's soot. Engines have to run a little "rich' (extra fuel) when they're cold and that sometimes produces a little carbon in the exhaust.
Another thing that happens when an engine is cold, the EXHAUST and muffler are also cold. that causes some of the exhaust gasses to condense on the side of the exhaust system. Since automotive fuels are nothing more than complex hydrocarbons, a good portion of the exhaust gas becomes an oxide of hydrogen that we lovingly call "water". Once the water vapor cools on the exhaust system it condenses and picks up the soot and it all drips out, sometimes out of the back of the exhaust pipe, other times out of the "weep hole" of the muffler.
If you feel that you're getting too much soot it might be a good idea to give the vehicle a good "tune-up", other than that, there isn't much to do about it.
On the other hand, if it truly IS oil, that's leaking out, you have serious oil burning and it's amazing that the engine even runs.
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