Terry wrote:
.....
Something similar with tyres? We have some indication that the branded OE
tyres on our 2002 bought brand new US built pickup have not the same quality
or amount of wear rubber as the so-called 'same brand' replacement which we
buy at a local tyre dealers!...

Most OEM tires are quite a bit cheaper than what most people buy as
replacements--it's simply a cost-shaving technique and they're simply
less expensive tires. About the only exception are on some
high-performance or touring sedans where they figure the potential
buyers will pay attention to such details...at least in the US, anyway.