Elastomer mounts have the particular feature that their properties change under the influence of dynamic and static stress, as well as environmental influences. These changes can be seen particularly clearly when comparing older vehicles with a new vehicle, To evaluate such changes in properties, static and dynamic tests have been carried out in the laboratory under environmental conditions, comparative to road tests, The results show which stresses and environmental influences cause the properties to change significantly. Furthermore, they make clear that - as a rule - a simple laboratory test cannot be defined which effects exactly the same property changes as a road test, with regard to the change in static and dynamic characteristic values, Depending on the type of mount and elastomer used, however, laboratory tests can be selected which provide useful evidence as compared with driving tests. The amount of costly road tests can be clearly reduced as a result.