We've had these sagging spots for about 10 years now. They're not getting any worse. Sure, we might get a new driveway in 10 years, but other than this, our driveway is in beautiful condition! They appear to be divots from parking something too heavy at some point.
It's the winter now and it's impossible to shovel around these things. A few years ago, we tried compacting some asphalt fill into it. It's like 2 inches deep, maximum. Of course the edge isn't going to feather nicely, and during snow removal, shovels get hung up on it. If you're walking with some force.. ouch, that hurts.
What I'm thinking of doing is first using the grinding wheel to remove some concrete, eliminating the need for a feathered edge. I'd trust it being more of a quality repair if I took maybe a quarter inch out of the concrete, and I could fill right to the top with tar. Feathering it is just asking for it to peel off. I would use a wire wheel (and full a face mask) to remove some of the asphalt chips we put down, giving the entire thing a good puddle shape to fill out. Then I want to stack two steel five gallon buckets with a brick spacer, cut a few holes in one, and set them up as a melter with my propane weed eater torch. Once liquid enough, I'd pour it down and use a few pieces of wood to smooth it out.
Does this sound like a safe and quality repair for a few years? Are there other methods you guys would recommend?