my brotax renaissance car seat was well used..
right now it would have coming up to 8 years old, but it broke in the summer
to be fair it has been used for most of the week days constantly for 8 years, but still LOOKED immaculate, and was tightly fitting and very comfortable etc.
It had been extreamly well looked after (i take them apart and inspect them and wash the covers every 6 months always)
anyway on my way home from the school run i pulled the tightener strap as you do (I am meticulosue and adjust the strap EVERY SINGLE journey and always have.... i loosen it before i unclik and tighten it again when they are back in
anyway i pulled the strap to tighten it and... CLICK.... this bit of plastic that hold the seat in its sitting up / lie back position snapped out...
it just broke just like that which meant that the seat was rocking from sitting upright to lieback mode all the time... clearly extreamly dangerouse.
I was so shocked as that piece must have lost its strength... what if we had been in an accident... i dread to think what would have happend if it had to take the energy of a crash, it would have broken leaving the seat flopping between lieing back and sitting up, which i imagine justmaybe could have caused the chair bit to come out of the bit strapped in
luckily it was the morning school run and my 2&3/4 year old was a big chap and just about 15kg so could for this one journey travel in his brothers britax highliner seat (from 15kg, but i think they need a 5 point harness until 4 years old)
luckily when i got back to there house DB was there and i borrowed the car seat (maxi cosi priori) from his car and am using that now...
so now matter how good your car seat looks (mine looked immaculate, so much so that my seat cover 7 years old sold for £24 on ebay and the car seat itself went to the dump) and even if it has never been in a crash, i think my car seat is proof that the do degenerate with age