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.
nothing impressive is not the final solution and the encoder belt after couple of months of heavy elevator traffic start to create some issues
