LOL - My Daughter has a 2021 Subaru Crosstrek, when she took it in to the Dealer for the 1st service/oil change the Service Rep tried to tell her that Subaru designs their new motors to ONLY use full-synthetic and tried to get her to accept that and the nearly double cost over a synthetic-blend. She called me from the shop (and in front of the Service Rep) and I told her that was 100% bunk and they were trying to upsell her on something she didn't need.
The Service Rep relented and said they would use the blend at the lower cost, but when she went to pick it up, they had still charged her for the full synthetic. So she talked to the Sales Rep she bought the car from, showed them the Subaru Web page that said the Blend was recommended and the full synthetic was NOT required. They not only covered the full cost of her service, they also filled her tank of gas (it was 1/2 full) and sent her a $50 gift card for her next service
Damn dealer staff need an education, and to stop trying to take advantage of their customers!