It really varies, some have loads of creaks, some none. Before I bought the one I have I tried a 55 reg GS300 with scabby wheels and some panel damage but no creaks. On the same day I tried an almost immaculate 55 reg GS430 and it sounded like the Mary Rose at sea.
This is the rubber I put between the dash and windscreen that made all the difference.
https://www.ebay.co.uk/itm/W002-uPVC-Window-Door-Wedge-Gasket-Double-Glazing-Rubber-Repair-Seal-PVC/232010232733?ssPageName=STRK%3AMEBIDX%3AIT&var=531203808284&_trksid=p2057872.m2749.l2649
While I'm at it, I read a review that said the GS uses oil, is this anyone's experience?