[icerabbit]

That does look like the beginning of it.

As expensive as tires are, as long as you're not near the wear bars yet, and the entire profile looks goodt; with 5-6/32 nds I'd keep using them for another while. Especially if you don't drive a lot and don't need to go out in inclement weather with high frequency.

Is the vehicle parked outside and in the sun all the time?

 

[icerabbit]

Blow-outs / blown tires on passenger vehicles are typically due to under inflation / leaky tire or rim edge; and prolonged driving with low pressure.
That's quite a difference from the first onset of tire rot with a some shallow hairline cracks showing on the surface.

Most often blowouts are seen with trailers, typically parked for extended periods of time, owner does not protect the tires, may see they're deteriorated or not and starts towing. Combine bad tire condition, some low pressure, heavy load, long trip ... and there you have another person with a blown trailer tire by the edge of the road.

A lot of new tires come with only 10 or 11/32 tread depth. At 5-6, start keeping an eye out and setting some money aside for a new set of tires, maybe rotate them one more time and then replace when they're getting to be 3-4 and next winter approaches, look for a later summer / fall special.

I just replaced the all seasons on our SUV at 3-4/32. I didn't care for going through another snowy winter with the OEM set, when we use the SUV most in winter.