I do this for a living in the greater Seattle area, even a polished or just generally sealed concrete will go miles to improving the longevity of your concrete. At the very least, get yourself a product called lumiseal fx, 200 bucks for 5 gallons, and apply two coats after cleaning and scrubbing the floor. Will repel water and oil and any other contaminants your tires may pickup. Epoxy coatings are on the more expensive end. What I mentioned takes max 3 hours to do and apply, and can drive on it next day