I've had a similar thing with a 1.25 Zetec Fiesta. It had done 115,000 and started to burn a bit of oil and the driver, my stepson, was never very good at checking it..
It basically ran itself dry of oil almost. Mark complained the oil light kept coming on going round corners..

That ran the big ends and it used to knock a bit despite thick oil. One day I got a call from Mark to say the engine had gone bang, there was a big puddle of oil underneath and the starter just clicks..
It had thrown a rod through the block which had bashed the starter motor and dented it to the extent it was beyond repair..
The engine was complete writeoff. I got another from a scrapper, did an engine swap and the car went on for another few years before the old tinworm claimed it..
The 1.25 Zetec is a wonderful engine - it's a Mazda engine - but needs looking after with regard to oil changes...