That's an advantage of having an old, already-broken car. The potential downside of messing with it is small relative to the potential upside. I've a friend w

That's an advantage of having an old, already-broken car. The potential downside of messing with it is small relative to the potential upside. I've a friend who has a nice BMW he drives every day but he recently bought an old junky Jeep and is rebuilding it in the back yard with his kids. They're a little too young to follow what all the parts do but not too young to learn that cars aren't just sealed black boxes; they're collections of parts that do things which we can take apart and put back together.