Where do you guys get this infomation? Mixing synthetic and regular oil is not a problem. I would like to see anything you can find that says otherwise. As for any strange running/stalling of the engine, its most likely the ECU/knock sensor problem of when the oil is first pumped through a new oil filter. Do a ECU reset and you should be good.
Cheers,
Chris Brunell
[This message has been edited by A4Killer (edited April 26, 2001).]