Simply the best! These guys are true locals, in that they give Petaluma the kind of old-town service our grandparents expected from their local mechanic. They are knowledgeable, fast, affordable, and trust worthy. They won't sell you something you don't need. And the prices are so good that when I call to pay my bill (when picking up my car after hours), I sometimes forget to even ask for the total, because I know it will always be less than what I'm expecting. They service all our vehicles, no matter what model or make, and we even buy our tires from them. Although a bit more expensive than Costco or Big O for tires, we go with Northbay because their service over the life of the tires will far exceed that of Costco, Big O, etc., and in the end is well worth the price.