Hi, This is a question about my dads '91 Audi 100 Avant Turbo. When you hit 3000 rpm the oil light (picture of oil can dripping on computer) comes on and beeps. It used to do this at about 4500rpm so he didnt care because he didnt need to rev it that far. The oil level is fine and the oil pressure guage is also sitting close to the max where it always has done. Any ideas what causes this as he's worried something will be damaged?