Oil Life - Dealer Service Issue?
Maybe the mechanical experts on this forum can shed some light on this issue for me. I took a new 2019 3500HD SRW into the dealer for its first oil change at about 5,800 miles, when the DIC said it was time to do so. 1rst service was on GM and they covered changing oil/oil filter and topping off DEF. The next week following this service, I found a DIC warning stating I needed to put DEF in and poured five gallons into the tank. Well, this seems simply like the dealer did not top off DEF as stated. Here's the concerning issue: 2800 miles on truck after service and DIC states it needs an oil change again... Any advice other than dealer did not change the oil or oil filter as they said they did? Should I be concerned of any mechanical issue?
2nd related question: Does anyone know of a contact at GM who seems to care what it's dealers are doing, or not doing, other than the typical 800 customer service number?
Thanks in advance.