Forgot to mention doing my research on the vivaro problems, It seem that a cdti engine which we also had in hower vans just could not tackle the slightest upset without causing or stupid problems.
If your turbo fails, they have clean all fuel tanks and pipes filter and then put a new turbo on.
Transit has problems but will carry on its work,
If your vivaro happens to be one of the good ones, you should enjoy it.