As an off-roader, I’m quite familiar with those kits. Those tire kits are really focused on getting you back to civilization when you’re in the backcountry. They’re really more of a temporary solution, I would treat such a repair with caution regarding high speed, highway driving.Damn. This repair kit can’t be used to patch it up?
What is the acceptable tire tread depth difference for the AWD?vulcanizing tire cement
If the cut is just in the tread, it's not the end of the world until the tread starts to come apart. Which it will. You could try just filling the gap with the cement and sealing the tread down. That may delay damage to the tread. I would NOT put a plug in it as that requires actually forcing the plug completely through the tire. Makes no sense if it's just tread damage.
I have one lightly used tire and will do a tread measurement comparison. Tire shops here in Boston don’t do shaving. They said it is illegal. One tire shop told me as long it is between 2-5/32 difference between the old and new it should be ok for AWD.Tirerack will shave tires down as far as 4/32nds, IIRC. I think it's like $25. So, you could always get one from there. Measure the other three and see where you're at.
I have a new tire already that discount tire sent it to me a while back. I don’t want to purchase another tire.Tire Rack is mail order so, if they do shaving, that’s probably a good bet. They’ve been reliable for my 35 years of car ownership.
Me, personally, I wouldn't go any higher than 2/32nd difference. Think about your differential. It's gonna be sitting like this / With the fluid pooling up on the one side but dry on the other. And, hey, maybe it's not that extreme. But, after thousands of miles do you want to take the chance that it may or may not do some real damage?The tread difference between used and new tire is 4/32. Is this ok to replace just one tire ?