there is no any warranty if car is not sold from garage under some extended warranty . how have u warned the garage about engines condition?i wouldnt take any car at all if somebody would tell me that they think something is wrong and it might broke but i must be carefull. if it happened ,it happened . i dont think it got big damage if it was just sitting in garage ,wasn't driving on some motorway so engine wasn't running high revs before something broke .btw it fails chains ,but not tensioners ! chain get stretched and only after tensioner might get out of his moving limits .