Orson’s big secret plan to hold the guards at bay needs a bit of on-the-fly revising.
Hovercraft, especially Halo Security Forces models, burn through a lot of oil. Because of the delicate turbomachinery required for lift, the engines use a special volatile ferromagnetic oil blend. It does its job well, but it quickly becomes a fire hazard once clogged with dust. As a result, the HSF goes through more lubricant than fuel in any given year.