I had the same issue. So here you go

Firstlydo you use 0-30 W oil (The one it tells you to use) I have had an issue with the oil weight causing the light to come on and off.

You want to check the oil level is ok (you done this already). then you will want to check the Oil sender unit is ok and your oil pressure is good. To do this you need a pressure gauge (with a M20 or M25 fitting on the end). Attach this to the oil sender unit which is located under the oil filter (FYI this is a pain to-do and right next to the pulley and belts, also you need to know the oil pressure values for the different RPM values, so I had a dealer check this for me). If your oil pressure is good then you most likely will need to replace the oil level/pressure sensor.

So to replace the sensor you will need to order the sensor (use autozone as they are about $150, and the dealer is $209) and also order a oil pan gasket and RTV sealant (~$35).

Simply drain the oil, remove the oil pan (use the tab on the drivers side to break the seal, mine was on pretty hard). take out the sensor (4 bolts). Clean the pan and the lower engine face, install new sensor and seal it back up. I took me about 3 hours to complete this. its not that hard and download the service manual from this site.

Since I change ours it worked great no issues. Up to the point that an uninsured car hit me... Now looking for a good body shop in Houston..

Good luck