...The filters on these cars are cartridges which look like small, cylindrical air filters and go in a metal container from the top of the engine, which is topped off with a plastic screw cap...
Ah, gotcha.
Old Morris 1000s and the like had a metal canister - like a mug with no handle - with a paper filter inside.
There was a bolt at the base and a thin 'O' ring to seal.
The ring was in a recess on the engine block and they were a pig to change, but if you didn't the chances were it would leak.
It was recommended to change sump plug washers as well, although we often didn't without any problems.
Some sump plugs had a small, stubby magnet on them to collect swarf.
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