UNDER WHAT CONDITIONS????? WAS IT HWAY? STOP AND GO?Did they have the same problems with Mobil that every month is listed here on BITOG?Did they burn more with Mobil? have valvetrain noise increase ETC??Remember Mobil was in the Consumer Reports NYC Taxi test and it was shown nothing was different in wear vs convential oil when Consumer Reports that does not sell oil, tore down the engines, without a motive to sell anything.. Consumer Reports re. wear nothing different with 3k or 6k. I know now the oils are different blah blah blah.