Oil pressure?

[Matthew Barrett]

Before I present my problem to the list, I feel a quick introduction is 
appropriate as this is my first post.

My name is Matthew Barret and I live in Tacoma, WA. I am 18 years of age 
and currently taking classes at a local community college. I recently 
purchased Derek Pulvino's 200q20v in November, and have inherited all of 
the problems and "character" that the car has. (I'm sure Derek is glad 
to have the A4 and less problems to deal with.) I am sure I will 
resurrect some of the posts he has already made, (oil burning, rear 
caliper rebuild, etc.) but for now I have a new problem that has come up 
in the last few days.

For the last two months, when I have turned the key to the "on" 
position, the oil pressure gauge would jump up to 5 bar, which as far as 
my understanding takes me is normal. Yesterday, the oil check light came 
on and being that I hadn't checked it for a week or two, (school and 
work schedule sucks) I added about half a quart. (It burns a quart every 
500 miles) Now the oil pressure gauge barely moves when I turn the key 
to the "on" position. As soon as I start her up, oil pressure jumps up 
to 5 bar and it runs the same as it has since I bought it from Mr. Pulvino.

Obviously, this problem worries me. Curious if anyone has any BTDT 
experience.

TIA

-Matt