Called to get a quote on my 2021 K5 for oil change at the dealership. He gave me the price for Synthetic Blend. I looked in the manual and saw it recommended full synthetic. I go make an appointment at the same dealership online and you have to put in your VIN etc so it knows exactly your car and info. I click on oil change and it gives me no options other than oil change. I complete my appointment and it says Synthetic BLEND. Im like WTF. I call the dealership and they said oh sometimes theres a glitch online. I said there must be a glitch too with your service dept because I called them and they also said Blend. I'll be taking my car someplace else...