Hello, In the past few days the Change Oil message has been popping up on my odo reader. This is a 06 GMC Sierra 4.8 truck. Anyways I changed the oil about
2000 miles ago, currently only has about 7000 miles on it. Anyone know why it's saying I need my oil changed? Also without much debate, what's a good non-synthetic oil? Does it matter, which I heard different brands aren't that god. Currently I just use Penzoil?Thanks for any info. Bill