Service was excellent. The only comment I have is ...

Service was excellent. The only comment I have is that the Maintenance Log I received when purchasing the Sonata says to have the first maintenance done at 3,750 miles or 6 months. I've had my new 2019 Sonata for only 3 months but had 4,466 miles on it, so I took it in for servicing. The guy at the dealership said I really didn't have to bring in the car until 7,000 miles or 6 months. My question is, why the discrepancy between what the Maintenance Log says and what the dealership says?