My first DIY oil change on a new Subaru Forester did not go well The drain plug was overtightened and, possibly, the dealership did not use a crush washer. Even a 6 point socket on a breaker bar would not get it to budge. Not wanting to damage the oil pan, I decided the best course of action was to use "one of those" dipstick pumps. This pump, which I bought from Amazon, got most of the oil out and I was able to complete the change. Judging from the oil capacity and the amount of new oil, the engine took, I'd say that (maybe) a pint or so could not be extracted. In view of the current situation, I'll probably keep using the pump and, possibly experiment with different types of extractor tubing.