hi, I have a 2001 seat arosa 1.0s and for about 4 months now I have had something wrong with the oil pressure and tappets, the oil pressure light and buzzer comes on after a high revved journey , i.e if im on the motorway then I come off and the revs drop the oil pressure light will come on, beep at me flash for abit then go off then a few minutes later will come back on until the revs get higher, it doesn't come on when its cold either, I also have really noisy tappets, there is a sufficient amount of oil in it and im just getting sick of the constant beeping from the dash and the tapping , please can someone help it would be much appreciated.