should you ever go back?

Yes it will, by the condition it's in! The difference is, if they've treated it well you'll reap the benefits with a car whereas a woman will try to make you feel inadequate. If they've treated it badly, on the other hand, you get the pleasure of seeing it regain what it's lost. Unless it's turned into a complete basket case, of course, but a lot of women do that as well ;D

As for the OP, it really depends on the car itself and whether it was one you loved or "just transport".

Out of the cars I've owned there are probably 4 that I'd have back like a shot (sadly, all scrapped by now). I moved them on for one reason or another (that I also don't remember) and don't / didn't regret it cos the reasons were what they were at the time.

The rest were just transport that I used and abused and might have another the same but wouldn't go out of my way to.

So, if it was a particular favourite and it's not coming back as a basket case, I'd say go for it!