I found this site while I was setting at Holman Motors to get my 2011 GMC Sierra Z85 checked out for oil consumption. The truck has 11,800 miles on it and uses oil. Their test was to charge the oil and charge me for a change and told me to check the oil Evey thousand miles. I've have never heard of a new truck using oil but they told me it was normal. It also been the shop for 7th cylinder fouling plugs. Any one having this issue?
