Hi Colin, i certainly would not crank the engine over to pump oil out, If it does not run, then I would drain the old oil out using the sump plug, and change the filter which I think is just the one long bolt that goes through the filter canister.If the car can be got running, then I would see how dirty the oil is, and drain and replenish with a flushing oil and run until warm, and drain it all out leave overnight, and change filter too, and put fresh oil in. Re filters they are available no problem, someone on here will know a part number of a known manufacturer. Best join the Flavia Consortium, very helpful. Hope this helps