I should have learnt this lesson the first time I changed a chain , first one lasted around 4000 miles before needing adjustment after nearly every ride. cost around £55 . The last (Just changed) was described as genuine factory replacement + sprockets ,Pain in the arse to fit as it was endless ! Seemed quite a good heavy chain ,but after only around 3000 miles it started needing adjustment, then recently i noticed a sort of rubbing sound as i was riding along.
Close inspection revealed red rusty side links. This I thought odd as I had always lubed the chains on both my bikes after nearly every ride. In the interim I lagged the chain with WD40 . (obviously not my usual lubricant) and re tried the bike , noise had gone, Back to base and re-lubed the chain with oil. next ride i came back with the chain almost hitting the rear forks. So this time ordered a known quality DID chain. during the process of taking of the old chain (using my usual angle grinder method) I levered on the ground link plate , Only to find that the rivet let go at the other side of the chain. This proves quite conclusively that the chain rivets were as soft as the proverbial shit !
On removing the chain completely , there was a mixture of seized and hanging links. totaly crap chain !
Odd why a chain should seize like this despite being regularly lubed.
My Thou is I think still on its original chain at around 29000 miles .never needs adjustment.
I have tried all sorts of chain lube over the years and think engine oil is as good as anything .