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the "push down" method isnt a very reliable method. instead, try visually checking each piston on your struts to see if there is any leaking or seepage around the piston where it goes into the strut body. you can also take the vehicle for a short drive and touch the body of each strut. a worn strut will be much hotter than a good one will be. not sure the exact life expectancy of a strut, but i would say that with constant driving on your average roads, 60k would probably be close to a good change out time. i would also check your tie rods, ball joints and bushings in the front end for wear. a good alignment shop can do this for you. dont get vibrations confused with alignments though, vibrations are usually the result of a bad balance or worn parts. does the vibration go away at speeds faster or slower than 75? you could have a bent rim as well if you have new tires and the problem still exists.
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