Geez they are bugging you for flight time on an oil can? I have seen one rather interesting trick. Minnesota Elevator Vertitron has this new fangled leveling system that works in conjuction with a viscosity control sensor. You can actually bring a hydro into the floor similar to a traction unit.
As to how reliable it is or how they perform over time I don't know. Maybe one of these other guys has dealt with them more than I have. These consultants today are just ludicrous to deal with.