Under normal conditions regular chassis greasing is unnecessary, because there are no chassis grease fittings used on Subaru models. The only time greasing is required is as part of chassis component repair or replacement, or if component dust boots and seals have become damaged. If its boot or seal is damaged or leaking, the component will have to be removed, repacked with grease, and a new boot or seal installed.
Because there are no recommended chassis greasing intervals, the chassis suspension and drive train components should be inspected regularly. If a visual inspection turns up a damaged component, dust boot, or seal, consult the appropriate information for the correct repair or replacement procedure.