Watching Wheeler Dealers, the British car show in which Mike and Ed buy fixer cars, spruce them up, then resell for a profit.
Mike found a Porsche Boxster S that the owner was practically giving away because the auto transmission was shifting poorly in lower gears. Mike practically stole the car for 1000 British pounds ($1700 USD). Ed changed the transmission fluid and filter, and it solved the transmission problem. He did a few more mechanical and interior fixes (resurfaced the brake rotors, new exhaust, recovered the seats, etc) and they ended up with bad-boy Boxster S for a total investment of 3450 British pounds ($5900 USD).
A killer deal, and all because the previous owner didn’t change the tranny fluid.
Oh, and they sold the Boxster for a profit of 3000 British pounds ($5100 USD).