It was somewhere outside Barstow when richard
wrote:

Anyone able to suggest anything?

Hard wood floor - best way is to ignore it for a week until the paint
is _really_ hard, then take it off with a cabinet scraper. Refinish
the oil patch, as necessary. Sanding or solvents will just spread it
and dump it into the pores.

This would have been better _before_ you went at it with white spirit.
You'll still get it up, but you'll have to go a bit deeper now.

Google recently for advice (oak table thread) on steel cabinet
scrapers, or how to make a glass one for this sort of task.