Oil, engine temperature

  1. #1
    When i turn the car on, it sometimes says its full or its totally empty(flashing) on a plain road.
    Also, when i am on the highway, normal speeds(100-120KMH), the engines temperature goes about 1/4 down, is this common? on the traffics it stays a lil bit up(barely 2 millimeters) from the middle.

    Thank you.