10 x 6 x 4. Approx 750mls from min to max, I think, on my Mk1. It's using far too much. Our 16yr old 115,000m 1.6 Zetec is using only about 1litre per 5000m. But I have carefully maintained it with oil and filter changes at least every 2yrs/ 12,000m so it should last a good while yet.

Have you noticed any blue smoke under hard acceleration or idling? Its good that you are using 5W30 semi syn, because these units are incredibly picky on the viscosity, chances are it may have been driven hard early in its life and on the wrong viscosity.

Thanks everyone for your responses.

I'll check tomorrow for blue smoke when idle.

I'm considering using STP Oil treatment (£5.99) to see if that makes a difference. Halfords website says it 'reduces oil consumption'.

Scotty Kilmer on youtube suggests this symptom could be caused by a faulty PCV valve..but not sure if my Ford focus has one of these?

My other option is to call a well known vehicle breakdown company to try fix this and would only pay a £35 excess on a particular policy I have.

Any other suggestions would be appreciated.