Think its my turbo
 

Hi I got a mazda3 1.6 diesel ts, it's driving okay at low speed but when I put my foot down to go like over 20mph it makes a rattle noise and blue smoke is coming out the exhaust when I lift off it go but car still drive not losing power or anything but I did notice when pulling off and when I was stopped one time the engine was vibrating a bit more than normal next time I stopped nothing. I spoke to two people one said turbo have gone cause off blue smoke it must be sucking in oil and do not drive it and other said he haven't heard of turbos making a rattling noise before. I checked the oil it's fine cause I checked it all last week cause I was working on it changing the altnater on it please help need to get work thank you