If I understand other tech posts in the past, the main problem with the m103 engine is valve seals/guides, and the main shortcoming of the m104 is head gaskets. Both these problems would seem to show up around 100,000 miles if I understand correctly. If the above is true, which of the 3 engine models/years listed by Chiraqp (m103 3.0L 88-90, m104 24V 3.0L 90-93, or m104 3.2 93-95) would be the best to hunt for? Reliability and long term ownership cost are more important to me than horsepower. Thanks to everyone for all the great info on these cars!!!
87 300E, 62k miles