The engine drain plug can be a real SOB to get loose. I used a 10" long cheater open end wrench, but know this. Most standard issue allen wrenches cannot reach the drain plug using the short end of the wrench, because the skid plate is in the way. When you use the long end, you get a tremendous amount of torque flex, which makes it very hard to break the plug loose. Here are your options: Liquivac system to suck the oil out, use vise grips on your allen wrench, or drop the skid plate and use the short end of the wrench. Recommended torque is 16 ft. lbs. or 192 inch lbs. In my humble opinion, I think that is over doing it for that size plug, but they didn't ask me!