Some people like to over maintain their vehicles.
All the cars I have bought in Japan an imported to the UK have had lots of history regarding oil changes, intervals have always been on the short side and annual mileages low.
10year old vehicles with 60/70k km for example is typical of many Japanese vehicles.
People say that they have never had an oil related failure which is great, but just because it doesn't fail doesn't mean there isn't extra wear.
I know somebody with a 2010 116i, low miles and after 2 years of short tripping and City miles the camchain went, it was thought he tensioner seized and the chain jumped.
Now was that an oil related failure? I suspect it might have been related,
Oil is cheap, engines are not.
BMW has fairly lengthy OCI in Europe, they also have a reputation for camchain problems. The worst being the 2.0d. Mercedes also have long OCI, and I am starting to here about more and more people with the 2.2d engine having Camchain problems.
The diesel Pathfinder (R51) has very common Camchain problems, as early as 80k miles but as the miles get to 120k or so they become more common. Also in the Navara with the same engine.
My Pathfinder stuck with the 18k OCI for the first three years, though it did motorway/highway miles for those years and had 5 Services when I bought it.
I ignored the 18k miles interval and done it every 6 mths or so, Regardless of miles. Net result was at 150k miles the camchain was still fine.
You pays your money.......