Some are, some aren't. The chain crimp tool costs ~$200 from aftermarket vendors. If you have only 1 car, it's better to just rent it from IMPCO. If you have a bunch of MB diesels that need chains, you could always buy the tool, and then re-sell it... there are probably a lot of folks here who would buy it if the price was right! I picked one up pretty cheap this spring, but it came with the insert for single-row chains (gas engines). I need to buy the insert for the double-row, which will be ~$40 I think. I have one or two chains to do this winter.
