I took the vehicle to the Tire shop and the tech said they look fine "they've had an easy life" but cautioned me to pay attention to how they handle on the road. Just looking to get second opinions here.
All the claims of them not being safe because of a magic number, accounts conservatively for a wide range of circumstances.
So if the tire manufacturers claim 10 year condemnation, it surely considers UV, sunlight, etc., and then a safety factor.
Do tires dry rot? Yes.
Are they a safety hazard? Yes.
Will they magically blow up at 10 years? Of course not.
You will risk cracking, leaking, or a blowout.
I wouldn’t run hot pavement, heavy loaded, and high speed in the middle of the summer. I’d save to replace soon. What’s your use profile? What will you be doing with the truck?
As for the diff oil, my concern would be anything that has a media filter should probably be replaced. This is more because of the media and glues than the lube. Doing things like the differential is probably prudent after a decade, but there are lots of vehicles that never get it done. If it has been done at some point it’s well ahead. If you were going to keep and use it, I’d do them all. If you’re going to sell, it’s on the new owner to baseline all fluids to what they should be.
