Welcome to the forum. You can never go wrong by following the recommended maintenance stated in the manual provided by the manufacturer of the vehicle. Yes, dealers and shops will always try to up sell unneeded/unnecessary maintenance items, so be an informed consumer and educate yourself. If you just purchased the vehicle, it would be a good idea to go back through the mileage intervals and catch up on maintenance items unless you know for a fact (documentation) that a particular maintenance activity was performed.