We are selling my husbands Mercedes SLK 350 2005 with 55,000 miles. We sent it to our trusted small local mechanic to remove wheels and send alloys for refurb(super job) and for valet to achieve best possible price. It has come back with a horrible creaky roof and much bumpier ride. Tyres are the right size and properly inflated. He has since applied an autoglym product to all the seals and in have asked Mercedes for a lube for the seals but they say they just use water.

The mechanic would like to look at a car and take it to local Mercedes specialist, is that the right course of action? Could something have gone wrong at valeting? It was on a ramp for 4 days. It had its MOT during this time also and sailed through that.