GagaJo
Car engines / tyres leave me cold. I used to be able to use an oil dipstick, but my current car is too complicated for me.
It would be really useful to be able to use the oil dipstick, measure the tyre pressure and put air in.
To be perfectly honest, with today's cars, there's actually very little that a 'home' mechanic can do anyway. So many electronic components now, which require specialised diagnostic equipment. My husband and I used to compete in car rallies, and I took a few car maintenance courses, so I could change most parts, including an engine if required. I could still do basic things like changing a tyre (which I personally think should be part of the driving test anyway), checking oil, water levels etc, but much of the more complicated stuff is way beyond me. Even my husband, who used to do all the maintenance himself, won't touch a lot of it now.