Bladegrabber
The 30 minute is to give enough time to land "safely" after loss of primary lube. Secondary glycol is fine, the 429's case reservoirs that trap oil after most has bled out is better as it has been demonstrated to allow around four hours at flight powers. Run dry to my knowledge is not a requirement. It is loss of primary lube/oil due to seal/line/filter failure where the bulk of the lube is lost.
SAS, by any measure the 12 minutes a 92 can last before catastrophic failure is inadequate.
The Sultan