Focus Zetec oil & cutting out problem, 1.6 V Reg

Gotta colleague who has above car and it was only firing on 3 cylinders. Local garage did new ignition coil and HT leads. Since then she has been aware of vibration noise and it has cut out a few
times. Returned to garage who did a test drive, could eventually hear noise and the car did cut out. Cuts out when warm, not just from cold. Garage have spent 1.5 hours today trying to isolate vibration noise - it is plasticky and seems to be related to revs. He has tie-wrapped a few possible bits but still can't find it. Says that it is nothing dangerous.
BUT the guy says that the oiled is black and overfilled - turns out she got a "litre of oil for a modern engine" and poured it all in a few months ago. She has owned the car for 8 months and not sure when it was last serviced. Methinks that his quoted price for an oil./filter change of 49 is a bit steep - but it needs Ford Zetec oil, 5 - 40w apparently. (local Ford dealers do it for 45).
So . . . I think that it needs an oil change anyway as it has only been used for local journeys. Any ideas tho on what could be causing the cutting out problem please? Garage guy suggested that cutting out could be caused by poor oil flow when cold????? Never heard of that myself. Focus Zetec oil & cutting out problem, 1.6 V Reg
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Best idea get some Ford dealer which has a clue. This is complete nonsense, if the oil flow would break for just a second, it's very likely you'd need a new engine, in many cases it's cheaper then fixing the engine.
Get a dealer that has some idea about cars.
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