I maybe wrong here but I don't think they actually sense the oil. The type of use is logged i.e. how many cold starts, amount of time in stop start traffic, cruising, full throttle etc.A lot of these cars have oil condition sensors now and they tell you when they need a service.
The main point being to keep servicing costs as attractive as possible to fleet buyers and to be able to offer cheap servicing packages (read that as doing the least possible) to private buyers on PCP deals.
They're not too bothered about year 5 or over 100k miles.
Modern oil is good but personally I've always had oil changes at 10k max or every six months. I used to have a Saab Turbo, they suffered with horrendous oil sludging problems, no matter how good the oil was it looked like runny tar in the sump if it wasn't changed at 5k intervals in say a 5 or 6 year old car. Result complete engine failure or at best new turbo and a sump off clean of the internals. Pretty sure VAG and BMW have suffered with it as well.
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