One day - all of sudden - every time I start the car on a cold morning, the amount of smoke that pours out of the exhaust is horrendous. It only seems to appear after driving more the 50km in a trip - which really isn't that far!

I've heard all sorts of things - oil flowing back into the engine. But how come this after 4 years and not before?

I try and park away from main car park areas, just in case I blow smoke everywhere