More than twenty years ago, Dean and DonnaRae Caccavo made a pact: they agreed that they’d never spend more than $10,000 on a single car. Over two-plus decades and through much inflation, they’ve kept this promise to the present day. Has this meant a life of limping jalopies and calls for roadside assistance? Far from it. When the Caccavos made the “$10,000 Rule,” Dean was on the hunt for a BMW E28 M5. He found a 1988 model for just under $9,500, snapped it up, and today, more than 200,000 miles later, it’s still his daily driver. Dean enjoyed the E28 platform so much that he eventually bought a 1987 535is for DonnaRae–for less than $10,000, of course.