The Mercedes-Benz 300D was first introduced in 1976. In 1977, it was first offered as a U.S.-sold version of the company's W123 series of cars. The car contained a 3.0-liter diesel motor, as signified by the D in its name. Like all used cars on the market, its current value is determined by its condition.
An 1977 Mercedes 300D will sell for about $5,425 as of 2011. A vehicle that fetches this price will generally be in good condition and be fully operable.
Mercedes 300D vehicles that are in excellent condition may fetch as much as $7,750 as of 2011. Vehicles of this caliber have usually gone under a restoration or show very minimal wear, according to the National Automobile Dealers Association.
A sampling of five vehicles found online for sale in early January 2011 showed a wide range of prices, depending on the condition of the car. The average price for the five vehicles was $3,530, with the highest-priced of the five listed at $7,200 and the lowest-priced listed at $1,250.
