I've noticed the comment to change the oil plug washer several times. Been doing oil changes on my car, wife's car, etc for basically 30 years and never changed a drain plug washer. Never had an oil leak issue. Is this a problem with Mazdas? If one is worried about grit, simply wipe the washed down and the area it covers on the pan.
A washer's purpose is not to seal, it is to prevent vibration from loosening the bolt or nut over time. You should be able to de-thread the nut 75% with your fingers before you see any oil trickle. If not, your nut and pan threads are not manufactured properly, which would likely affect ever car manufactured, hence my question about if this is a Mazda thing.