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It's my personal opinion that the "family" (many design similarities) of the M111 four, M104 six and M119 V-8 are some of the best gasoline engines ever dropped into an engine bay. Despite some problems with head gaskets on the M104, all three engines are built to a high standard, last a long time and have bottom ends that don't seem to wear out.
I have seen examples of all three with 400,000kms and more, and all were in tip-top shape with no major repairs. The M119 in 4.2L and 5.0L form is a great beast with a few minor problems easily solved (tubes) and the overall reliability of the engine is superb. Thanks to this, the W124 400E and E420 cars are some of the best cars at rock bottom prices today.
In the W140, the M119 engine is thankfully problem free, since many other aspects of the car can run an unsuspecting owner to the poor house.
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