Hi,
can anyone help me. I have a Vectra c 1.8 2003 16v. The oil pressure light keeps coming on. I would top it up with 2 letters of oil, and the light would go out for maybe 2 weeks and then come back on. THis happened for a good 3 months.
Then i recently change the oil to see if this would help. I changed the oil and again 2 weeks letter the light has come back on.

Any one ever experianced this?? and how can i fix or test oil pump, pressure valve and oil sucker in sump??

Thanks