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T6 in our 2015 Duramax, and AC Delco filter. if I am towing I will generally change it around 7000 miles. When not towing I let it go 10,000 to 12,000. Always change it myself. 15 minute process that takes me longer to grumble about it and find the tools in the box than to change it. Recently been wondering if Lucas makes a diesel oil as I have always liked their racing oil. (used it in our 2004 gto with K&N filter and got 178,000 miles out of it before the accident that totaled the car.)
Paul
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