Urethane is fantastic for shockies, steering etc, but it's a bit hard for engine mounts. A hell of a lot of vibration and noise can be transferred from the engine/transmission to the body and you need a bit of softness to absorb it. Urethane is too hard. Later VWs used hydraulic mounts that cut the vibration transfer to almost nil. Diesels are awful unless the mounts are good and properly aligned.
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