Knightrider....I have the constant clatter from the engine. When I first start up, its loud for like 5 seconds then goes away, but I hear a faint clatter from the engine. Especially when I give it hard acceleration. Taking to dealer for oil/filter change, not a small mechanic. So HOPING its just not the correct oil. HA!! Oil pressure gauge shows fine. But going to have them check the health of the engine. I want to be prepared for the cost. Ive started using 89 octane to see how that goes.