This recipe from my hubby's sister won a family cook-off two years ago. It truly is the best we've ever had! We even brush it on hamburgers before grilling.
World's Best Steak Marinade:
1/2 cup olive oil
2-3 tablespoons of McCormick® Montreal Steak Seasoning
Mix ingredients in a plastic zip-lock bag, place thawed steaks in the bag, and refrigerate, turning every 20 minutes or so for up to 3 hours before grilling.