The diesels are inline engines and have a shorter chain. The M103 and M104 6's can go very a very long time before you have to change the chain.

V8's tend to have long chains because they have two banks.

MB improved on the M117 and M116 with the M119 and now the M113.

Btw MB isn't the only car that needs this. The V8 in the Jag XJ8's wears them fast also. The top ones and the tensioners should be done every 60k-80k on the Jags. The lower chains however last longer.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200