Check the maintenance schedule for your vehicle (it's in the owner's manual or a separate booklet) to see what the manufacturer requires. Chances are everything you need could be done at a competent repair shop that is more convenient or less expensive than a dealership. Don't assume, however, that a dealer will always be more expensive. They may charge $40 or less to change the oil, rotate the tires, inspect the vitals and throw in a car wash.
It is important that you recognize the difference between an EIN and a DUNS number. Although the EIN number is used to report and pay taxes to the IRS, it is not used to establish credit for your business or to report your credit history to the credit bureaus.
Who can get a DUNS number? The DUNS number is often called the Social Security Number for businesses, but there are millions more DUNS numbers than Social Security numbers and any business in the world can apply for and get a DUNS number. Just about anyone can get a DUNS number, including: Businesses; Non-profits; Government entities