Why does my 2007 Buick Lucerne engine make a ticking noise?
I purchased an '07 Buick Lucerne CXS w/ a NorthStar V-8 on 08/30/201. It had 59,606 miles on it. At some point I may have noticed a ticking sound from the engine. I had the oil changed three days ago using a synthetic blend of oil. This morning I drove to work at freeway speeds for thirty-five minutes. When I pulled into a fast food drive thru I noticed a very pronounced ticking sound from the engine. There is a Youtube video that shows a Cadillac NorthStar engine making the same identical noise as my Buick. Any ideas as to what this is and how to fix?