I drive the '75 240d almost daily (~60miles). The tranny needs some work, but it's the best car I have for long commutes. We just drove it down to LA, about a 2,000 mile trip in 2 days of driving.

As for where I park it....Away from other cars in the back of the lot. I always leave the key in the ignition on all my vehicles. If I don't I'd lose it. I don't worry about anyone stealing it b/c no one (tire guy, etc) that I have gave instructions and demonstrated can manege to read the knob "pull to start" to start the car. People also seem to have difficulties with reverse, so I really have no faith in anyone figuring it out.

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1975 Mercedes 240d (Daily driver, town)
1980 Toyota HJ45 (diesel) (Daily Driver, Farm Implement)