Originally Posted By: rokwldr
I have a 2006 GMC Canyon with the 5 cyl. Mobil 1 10-30 since new now with 90,000 mi and no change in sound. It says it requires 5-30, but that is to light for S. Fla and me. At 100,000 mi maybe I'll start using HM oil possibly 10-40.
Hey rokwldr - Have you tried Pennzoil Synthetics for your GMC? We're starting up another round of our Used Oil Analysis program for 2016, and we'd love to have you join us. For more information, please send us a private message. Talk soon! - The Pennzoil Team