We have a 2006 Highlander. Whenever we take it for regular servicing, the service technician recommends some items not specified in the maintenance manual. We told him that and he said it is common for the maintenance manual to not indicate all the items needed. For example, he recommends PCV valve replacement and fuel injection service which is not there in the manual. What recommendation should we follow?
Take Timo's advice. If it 'aint broke, don't fix it. If it's not a scheduled service item, don't mess with it unless you've actually got a problem.