M113 is great. I have one in my family with 150,000 km (in an ML no less!) and it has had not one single engine problem in that time. Same goes for M112 my father had in the '97 E320 (with 95,000 km when sold). No leaky cam adjusters, no where near as hard on engine mounts as the M119, twice as fuel efficient and we caught both the balancers berfore they hit the timing covers, not that the balancer counts as an engine problem in any case.
Having said that, I too love the M119 especially post '94 builds (having got rid of the distributors).