As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER ENGINE START WITH BLEEDS OFF AND APU AIR ON, CABIN FILLED WITH SMOKE. AIRCRAFT RETURNED TO RAMP AND APU REPLACED. IT IS SUSPECTED THAT RECENT RASH OF OIL LEAKS IS DUE TO COMPANY CAMPAIGN TO REPLACE EXXON 2380 OIL WITH CASTROL 5000.