According to the FSM, W123 engine mounts are not compatible with W115 engine mounts because the shore hardness is different (I have attached the page for reference). I need new mounts in my 220D W115, and the dealer wants $150-$200 per mount. Via another source, Phoenix/OEM engine mounts are available for W123/W116 cars for less than $50 each.

Is this just Mercedes over-engineering everything? Do you think there is any harm in using a stiffer engine mount in my little 220D engine? I have a loping/hunting idle, and the idea of a stiffer engine mount sounds okay to me right now. My car aspires to be a daily driver, so ride quality is not a concern.

Has anyone tried using mounts intended for a different vehicle? Thanks.

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