I've put about 1500 miles on my 05 VDP since I got it three weeks ago. Ticking started out very intermittently but has slowly gotten worse. Only been 2000 miles since Pennzoil platinum oil change according to sticker. Oil level is good. Was about half quart low but topped it off and no change. Thinking about using royal purple or something else "top shelf" for her. Also, my 99 suburban really liked a bottle of Lucas with every oil change. Made a huge difference. I realize these vehicles are different beasts, anyone else use specific oils or additives on their engines? Thanks for the advice!