"Today, there are 11 Advocates General, six of these posts are permanently assigned to the larger Member States. Advocates General are Members of the Court of Justice of the EU, and are appointed under the same procedure as judges. They enjoy the same privileges as judges (immunity), and cannot be removed from office before the end of their six-year term of office. They may be re-elected. Unlike judges, however, they only have an advisory role and do not take part in the decision-making on cases."
See: Role of Advocates General at the CJEU (pdf)