I have owned a Toyota since I have had a Drivers License......which lets just say has only been a little bit. About a year ago, my check engine light came on. I took my car in for a diagnosis, and they said it was an exhaust issue but they couldn't find anything wrong and turned off my engine light. It has not came back on, however, twice in the last 2 weeks, my oil light flashes on quickly but then quickly goes away. This happend one time when I stopped (sorta suddenly

) and the second was when I was going around a curve. Does anyone have any idea why if there was a problem that light didn't stay on? Is there a problem at all?
Thank you, I love my Toyota but I am a fan because I didn't think I would have to deal with mechanical stuff.