Slow leak as in defect or slow leak as in puncture? I just had the same thing happen to mine and was cursing the brand until I discovered a puncture on the sidewall most likely caused by me driving it into something... There has been a lot of discussion on the "china bombs", it all depends if you onsider the Towmax to be in that category. From what I have researched, I dont personally consider them to be. Good luck.