I've never had anything stolen from mine.....what I worry about the most is someone grabbing my nice stainless steel wheel covers that I use with snow tires on steel rims....very easy to take, fairly expensive to replace!!!

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)