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ATF stop leak in the engine is reputed to soften up the valve stem seals. Told to me by an old Fiat mechanic who did this to the twin cams.
Basically your lifespan is until a cop catches up with it or it runs out of oil accidentally, whichever comes first.
I'd give it a good dose of one of the PTFE treatments if the plan is to juice a bit more life out and run it into the ground. OIL ADDITIVES
That said I'd never use it in my own cars if it was a keeper.
My mum and now my sister bought from new a crollla seca around 98 model and they had a common problem with the steering in high k/ long time continuous driving models that they replaced the steering hub/bearings under warranty. Mum was a rep and on the road all day but it is religously serviviced by her and now my sisters husband(a mech) and has done over 450,000k's still going.
Engine life depends. I know of some that have lasted for years but one of these was a case of turn it off when RTA / Cops about and the owner took all our ould oil after servicing as it was too expensive to buy 4l a day for it.