hello evryone, ok where do i start. i have a 1999 astra 2.0l sri 65k on clock. for about 6months now, on startuo, there is a puff of blue/white smoke from the exhaust. it also goes through a lot of oil. i started the engine the other day with the bonnet popped, and through the gap at bottom of windscreen i spotted a puff of smoke come from what i think is the head seal??? also, when i am stopped in traffic, i get exhaust fumes coming through the heater vents. if any of u good peeps could give me any pointers, it would be much apprciated, cos i get the feeling this could cost me a fortune. could it be time for a new motor???