Hi nice car ...love the colour ,be carefull with the oil light comin on and stayin on ,i have a HSV Manta and the light started stayin on while drivin it so i checked everything as you do and was about to replace the oil pump as it had hardly any oil up top and was gettin a bit rattly but a clue'y mechanic friend said it wouldnt be the pump and to run it over to him ,as it turned out the oil pickup in the sump was totally blocked off with a very hard sludge ,so after liftin the motor up and takin off the sump and cleaning the crap off with a scraper and hammer as this sludge sets like rock all is good again full oil pressure and no rattles ..thank god for someone who knew wat they were talkin about as about 4 other mechanics said it was the pump