One question, did you try tightening the plug again, just torque it another 1/8th turn? I have never replaced those washers and to this day, have never had an issue with leaks. I suppose one could argue if the drain plug hole was tapped at an angle that could cause a leak.
Secondly.....why toss the oil at 1000 miles and especially why toss a perfectly good oil filter?
I work at a mitsubishi/hyundai dealership. I much prefer the hyundai washers and we change them every time They're interchangeable too...
My wife's Fusion's original drain plug had a washer "built in" but came loose and was lost at some point. It would leak slightly before I realized it was missing. Once I realized this, at the next oil change, I just started using the Honda aluminum crush washers we have.Jeep cherokees have the rubber built into the plug for sealing..
I've done that forever with our Hondas. If I don't remember if it's been flipped and re-used previously, I just replace it.On the civic I found if I torqued the drain pan bolt to 21 ft lbs, I could use the washer twice, I could flip it over and use the non crushed side for the second oil change. I know it was being cheap, but it can be done.