It's not even worth going anywhere else! I live about a mile from Marshall's so not only are they extremely convenient, they are so good I would drive 50 miles to go here. They are so professional and very fair.
I have taken both my Mercedes here and the service does not disappoint. Twice I went in for oil changes. They work on my car right away without an appointment and can have it ready within an hour. Each time I have gotten the oil changed, they make sure to call and double check that it's ok to proceed because it uses synthetic oil which is pricey. They always over estimate the cost as well which is always a pleasant surprise.
It is not worth taking your car anywhere else, they will be honest and upfront with you 100% of the time!