Hi Frank, we have not done this but from the reactivity point of view during storage we would be inclind to remove all grease from the reservoir and replace with Food oil ISO 220 or heavier and flush the system until clean oil is being expelled that way there will be a soft additived stable lubricant throughout the system with minimal chemical activity and aging over time. Off course this proceedure would be reversed when the grease system was put back into service.
regards
Rob S