I noticed the same thing in my '95. First oil change since I bought it. I put on a larger oil filter ( M1-301) to increase oil volume slightly, and put in Mobil Clean 5000 10w30 motor oil. I don't know what oil they were running previously. Seems to be more valve noise. I am approaching another oil change and would like to know if I need to change oils because of the increased valve noise. I have not "used" any oil since the oil change, in 3000 miles. Engine has 118k on it.