I have an old Mondeo (93' 1.8 diesel) why does it smoke badly when ticking over but seems okay on normal running? not using much oil even though smoke is blue! TIA..
You have some bore wear. Diesel pistons in this Ford are pretty oval.
When they heat up they expand. A bit of wear, and you have idle smoke from exhaust.
Pump and injectors probably out of calibration by age or mileage.
Drive it.
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