i use them year round on my S14… off the top of my head i cant recall ever warrantying rod ends… I know Sasha wanted some new ones which i did give him for one of his cars but i wouldnt call that warranty.
the worst that happens onb my s14 is some noise occassionally. i simply give it a spray with some grease and they’re good again. 4 years and 70,000km’s + 3 winters on them.