How long do the engine mounts last on the 124 chasis with the OM 603 engine? I know the 123 engine mounts need regular replacement but the 124 seems to have a newer/better design. The reason I ask is that I've noted a slight bit more vibration at idle and am wondering if the mounts might be the cause. They look good but I don't know how old they are. Are the 124 mounts better and not a regular replacement item like on the 123? Thanks for the input.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold