""there is faint blue smoke from the exhaust ,if you then remove the plugs and look down the bores all you can see is a layer of engine oil on the tops of all the pistons ! vehicle has covered 90,000 miles and runs really well on road with no misfire .Will the oil in the bore affect emissions that much or do you think this motor is just worn out.Compression tested the motor and the compressions were through the roof at about 200-230 psi""



100% oil control rings are stuck to the piston, these duratecs are renowned for it, giving you your exact symptoms(ie Co rising from idle to fast idle, high HC's, no fault codes .....etc)