damn 60K should only be about 800-1200 with parts. i usually do it for 300 + parts. but im just a shade tree Z mech. i get my parts from COZ www.CZP.us best prices on OEM stuff and you and any Z owner, MAINLY TT owners do NOT WANT ANY POS spark plug than OEM NGK pfr"X"b-11b.

but a valve cover gaskit leak sucks. if it's a TT do it in the car, NA pull it. but if it's just seeping slowly. screw it, and wait till the injectors are goign and need replacing or upgrading. and do then at the same time sense it's at the same level.

and more than likly the coolent is from the water pump or one of the 4 coolent line YOU SHOULD replace when doing a 60k. 2 bypass lines, or the 2 radiator hoses.