I think it is the oil level, I use a high quality synthetic, but am about 1500 miles past due on an oil change...at the very end of my trip today, my oil light flickered...my guess is that the level in normal driving is sufficient, but not in the turn. Not really sure why the oil level would have dropped since the last change (I don't have evidence of leaking or burning oil) but it is due for the change and I will update positive or negative results here. Thanks for the tip.