Have to agree regarding cars, our Mini is horrible to check the level, oil does not show on the dip stick as its metal coloured, have to lay it on a bit of kitchen towel to make sure its correct, unless oil is old and very black. ( and its got the normal Mini issue of it uses oil, don't know where it goes, no smoke and no leaks, just eats it, about 1lte per 600 miles) and BMW state that's normal !!!!, our old Discovery does not use a drop between changes.
Sorry, off subject