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.
In Uganda a TIN Number which is known as the Tax Identification Number is a number which is used by tax payers when it comes to paying things like government taxes for example motor vehicle registration taxes, insurance taxes, Import and Export taxes, Value Added Taxes (VAT), Company Taxes, Operational Taxes and many others.