Easy Roast Beef Recipe

Ingredients

• 1 (8 ounce.) bottle French or possibly buttermilk salad dressing
• 1/2 c. vegetable oil
• 1/2 c. red wine vinegar
• 1/4 c. black peppercorns, cracked
• 1 tbsp. garlic salt
• 1 tbsp. dry oregano, crumbled
• 1 (3 lb.) beef shoulder roast