I have 2012 manual civic (8th Gen) bought in May 2012 (just 4800 on meter). A month ago I noticed rattling/abnormal sound when I speed up my engine above 2500 rpm. Thic sound is like engine sound of LPG taxis. I am worried if something wrong with the engine. The sound doesnot come every time.
I got oil change after 300 km on advise of honda dealer in RYK (not because of the problem).