For some reason every now and again, as and when the car feels like it my C220 CDI is a horrible and embarrassing ride. Every little bump i take the back end squeeks, Now ive tried to oil the bushes which seemed to of solve the problem for a short period of time but it still happens i have just bought some Carlsson 1/16 alloys but i am not willing to put them on until this problem is fixed.....

Any ideas???