So I just did my 1st oil change on my 2015 PMC. Oil change indicator didn't come on yet but being at 7250 miles and a free weekend it seemed like the thing to do. My driving is 60% highway and I'm very easy on it. Oil was extremely dirty but the most concerning thing was with a filter change I only took out 3 1/2 quarts of old oil. I did just recently notice the slightest sound like a tap the week before. Could I have burned that much so soon? I should also mention I bought it as a left over just this past April so it's only really been driven for about 6 months.