Having once had the pleasure of maintaining a group-owned Aerobat, any variation of oil pressure -- or anything else -- would have scared the pants off me. On one occasion (probably more, but I caught this one red-handed) they ran it low on oil because the group member using it that day didn't want to pay for the Shell W80 topup. They finally ran the bearings by over-revving during aerobatics. Another group had a similar problem with regard to purchasing fuel, running the tanks dry on returning the aircraft as if it was a hire car. The result was inevitable, while nearing home the pilot became disorientated over cloud and his body was recovered from the sea a few days later. I don't like groups ...