What are the first parts i should replace/upgrade in my FD3S . The engine has 122K miles on it and I am deciding on full replacing it or rebuilding it on the same core?
What should I do to find out if the core is still good and is it worht rebuilding at 122K or just replacing?

Thanks in advance!

 

You need to take it apart and check the tolerences of all the parts.

 

Not to mention clean and, if necessecary replace housings, springs. seals etc.....