First of all the oil light is a really worry'ing problem. I struggled with a lot of problems on my car. The thing that worked best for me is buying the following

http://www.ebay.co.uk/itm/MECHANICS-...item5d446ad463

You can fit it easy on your car (pretty sure it fits the Original hole of the pressure sensor), but now you can read it out at different rpms

If you have low oil pressure don't drive it else you can bin the whole engine later on. Get your self one of these. Take somebody with you that can read out the gauge while you keep an eye on traffic and jump from idle to 2000;3000;4000 and post it here.

I believe at 3000 you need 2.8 bar and idle would be nice above 1 bar, but i think till 0.8 would be ok.


Then search further for the noise!