Hi I'm new to the site and it really is loaded with info, thanks. I did a search here but really can't find an answer i'm looking for. I have an 04 silverado with the 5.3l v8. It has now 13k on the odometer. I changed the factory oils at 3k with valvoline 5w30, and a pure one filter. Did the same at 8k. Now at 8k I switched to m1 5w30 and an ac delco filter. My goal is to go through the oil life monitoring system now for oil changes. From what I can estimate it would want you to change oil at around 10k miles. I assume the combo I used this time will be o.k. for 10k? Also I noticed, and it could just be my imagination, that there seems to be a small amount of valve train noise. Has anyone else noticed this with m1 or ac delco filters?