The 1987 300D is unique because it's the only year the 3.0L 6-cylinder diesel was in the W124 sedan in the U.S.. When buying a manual, ensure it specifically mentions the OM603 engine or the 124.133 chassis code to avoid getting a manual for the later 2.5L versions.
Whether you are tackling a routine oil change or a deep engine teardown, finding the right repair manual for a (W124 chassis) is the difference between a successful weekend and a stranded car. Given this car's legendary but complex 6-cylinder OM603 turbodiesel engine, a general guide rarely cuts it.
Great for beginners who want step-by-step photos. However, the W124 Haynes manual (often a UK import) is known for being a bit generalized because it covers too many different engine models at once.
Here is a look into the best manual options currently available for the '87 300D. 1. The "Gold Standard": Factory Service Manual (FSM)