I owe all the FF and FE drivers an apology for wrecking their race.
Group 2 - FE/FF - was shortened to 7 laps, due to oil at Turn 5. I still don't know exactly what let loose, but my car developed a massive oil leak somewhere in the left sidepod (oil sump and cooler) on the straight going down from 4 into 5. I saw the cloud as I turned in at T5 and pulled off-line before T6, but the damage was already done. The good news is that the engine was still running smoothly when I killed the power - the oil light came on right as I was hitting the switch. The bad news is that it dumped enough oil in T5 to end the race early and tear up at least one other car that I know of.
Again, I'm sorry for all the trouble this caused everyone in our race group.