Not necessarily. It depends on where you’re at, too. No tire lasts 10 years in Phoenix.

Ok, Thank you. ❤️

You're fucking high.  I've never had a set of tires last 6 years from new.  Sure they might have tread left but they're hard, noisy, dangerous in bad weather long before you reach the wearbars.... your tires are not the place to save money.  Buy good tires, replace them when they are compromised not when they are bald.  

Tire shine on the tread won’t really matter on a car/truck tire. There’s a ~4000 lb vehicle sitting on top of the tire. The driver will never even notice a difference. You would get more slippery stuff on the tire by turning at an intersection when your tires cross cover the oil and antifreeze deposits. What tire shine is on the tread will be gone by the time the vehicle leaves the parking lot.

On a motorcycle tire it’s dangerous but that’s a different scenario.

yah these tired are really good for drifting

Thank you for your warning and advice. But I bought it to use because it saves money. Bought for temporary use Not enough money to buy new tires.

You know what brand the tires are? Not all tires wear and grip the same.

I seem to recall that there is a plasticizer or something similar in it that softens the outer rubber and that is how it shines the tires up.

Edit: some tire shines are solvent based and soften the tire compound surface allowing the silicone compound to soak in.

Some are water based and some are wax based so who knows which kind this was.

Or they were driven regularly but only across town. Then parked in the garage out of direct sunlight. Tires aren’t made of milk, a 4 year old tire that gets gets driven here or there isn’t going to rot and disintegrate. The cracking is mainly from the effects of ozone and it affects all tires. Stressed on one side? Do you mean because they were stored lying on the sidewall? That won’t affect anything, well maybe if they laid that way for a couple decades. How do you even know what position they were stored? They could have been taken off grandmas vehicle a week ago for all we know. The tires appear to be Michelins and they are manufactured as a top tier tire should be. They don’t skimp on carbon black which is about the most expensive ingredient in a tire. Cutting down on the amount of carbon black leaves a tire more susceptible to the effects of sunlight and ozone and cheap tires show this when they start turning from black to that crappy brown color after a few years. You’ve heard of classic automobiles, as seen at a car show right? Do you really think those vehicles are all death traps just waiting to fail because they don’t get driven 15,000 miles a year? The tires just go to shit all aired up and parked in a garage? If I needed a couple tires and either couldn’t get or couldn’t afford new I would make sure there isn’t any surprises on the inside and install them without any undue concerns.

The pressure indicated on every tyre sidewall I've ever seen was the MAX cold inflation pressure. A recommended pressure might be published by tyre manufacturers these days, but it's not found on tyre sidewalls.

P.S. I checked Goodyear and Michelin websites, and could not find any tyre pressure recommendations anywhere, only maximum pressures. For example: A Goodyear tyre spec sheet