I have a mercedes benz c280 1999 model, when I
start the engen it starts and if I Rev too much
water comes out of the exhaust pipe, what could
be the reason for that
If you are running water in the cooling system rather than antifreeze could be a blown head gasket. However if you are using antifreeze in the cooling system and water comes out on a cold start it could just be built up condensation. If its not condensation then it is a blown head gasket and should over heat .