Combine oil, garlic, chili powder, oregano and red pepper in small skillet; cook over medium heat 2 to 3 minutes. Cool slightly. Stir in vinegar and sugar. Place beef steaks and marinade in food-safe plastic bag; turn to coat. Close bag securely and marinate in refrigerator 30 minutes.
Remove steaks; discard marinade. Heat large nonstick skillet over medium heat until hot. Place steaks in skillet; cook 9 to 11 minutes for medium rare (145°F) to medium (160°F) doneness, turning occasionally. Season with salt.
Nutrition information per serving: 348 Calories; 171 kcal Calories from fat; 19 g Total Fat; 7 g Saturated Fat; 8 g Monounsaturated Fat; 138 mg Cholesterol; 391 mg Sodium; 1 g Total Carbohydrate; 0.1 g Dietary Fiber; 41 g Protein; 4.9 mg Iron; 3.5 mg NE Niacin; 0.4 mg Vitamin B6; 3.2 mcg Vitamin B12; 13.4 mg Zinc; 34.9 mcg Selenium;