My S does the same and I think it's because the exhaust tilts upwards on the ends and moisture condensates and collects a bit of carbon which spits out upon a cold start up. (My Theory only).
My S does the same and I think it's because the exhaust tilts upwards on the ends and moisture condensates and collects a bit of carbon which spits out upon a cold start up. (My Theory only).
I believe that every gallon of petrol burned produces a gallon of water.If you do short runs the exhaust doesn't get hot enough to evaporate thec water which collects at the lowest point.I'm sure someone will be along shortly who knows the answer