I have alfa 156 2.0 JTS 2002 107k km(looks that is real) around 2-3k km a go started rattle sound on warm up engine. I changed oil but rattle didn't stop. This noise is alway at idle rpm and dissapear at around 2-2.5k rpm. Last time i even made over 600km trip without problem. No errors in multiecuscan, engine have power, easy accelerate to top speed. At 10k km used around 1.5L oil (selenia racing 10w-60). What can generate this sound only on warm engine ?