On my 06 I did it when the oil monitor told me. Rotella T-6 5W40. Usually twice a year, once in fall and once in spring.
On my 15 I get 4 oil changes by GM then I will be going to the Rotella T-6. I'm getting close to my first one, 24% left @ 9000 KM
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2017 GMC Sierra Denali HD
2014 XLR Hyper Lite 30HFS5
Toys-
Yamaha G9 Golf Cart
2010 Harley FLHX with lots of mods
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