blowing water and soot on start up

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I have a 2011 Prado 150 (60000Ks) Diesel engine , now and then when I start the motor the car spits a small amount of wet soot out the exhaust , I live in FNQ so it could be condensation from the humidity .My last Prado was a 120 and it never done it . Any one had this problem or any ideas on what it could be .