Oil Pressure Light

[filipharvey]

Checked the oil on Mrs' A4 at the filling station today and it was low. Real low. So I bought a small bottle of cheap oil ('twas all they had - CarPlan 10w-40 Mineral) and filled it to the required level.

Drove about 10-15 miles and the oil pressure light came on.
Stopped the car, and it had gone off so drove it home (2 miles). The light came on again. Once again I turned the engine off and on again, no light!
However, if I take it over 2000 rpm it will light up.

Any ideas what is causing it? It is running ok, no unusual sounds or anything.
Could it just be a sensor? Where is the oil pressure sensor?

 

[simonwjones]

Its obviously, the oil you added isnt up to spec. I would empty the lot and refill with proper oil


Simon

 

[filipharvey]

I guess the problem is related to the oil (although I'm sure I've used it before with no problems) but I can't see how it would affect pressure.
Would it?

EDIT: I've just checked in my shed for the old oil I had been using. It is a Semi-Synthetic 15w-40 another budget brand but it has the required specs on it. I have only been using that as my uncle gave it to me at some point.

Could it be the mixing of these two causing a problem? Is it now too thin or something?
I'll hold my hands up and say I haven't a clue about oils!!!

 

[audi80sport]

if im right and correct me if im wrong but if you use mineral oil then go to semi Synthetic or indeed fully Synthetic you cannot ever go back to mineral? also i read somewhere on this site i believe that the oil best to use is audi/vw own oil name escapes me now but it has something to do with the viscosity the ??w-??w if you get me? it needs to be a certain thickness...once again correct me if im wrong please...

 

[LaSarthe&Back]

Reckon your oil pick up pipe is becoming blocked. This makes sense when the engine is taken over 2krpm, as the pump is trying harder to push it through a smaller hole than usual.

Several S3's pumps have failed, worse case being a new engine!!

Do a search for oil pump, and then get it booked in for a new pump and pipe.

The pump isn't the problem, but being strained, you don't know when that'll give up the ghost either!
Best of luck
Andy