Originally Posted by
pee vee
them Zetec SEs are known for piston rings aint they? so it might well 'breathe heavy' ?
Edit: yes mate pressure is different for different types of engine.
Piston rings CAN go - Ford don't sell em seperatly though! They advise a new engine (disposable engines!) but you can buy em else where.
Might be worth going for pistons and rods at the same time while it's apart.