low oil pressure on the track

[Hatzenbach]

Hi,

this is a bit of a re-post of an older post, so forgive me if you've seen this already.
So here it goes:

Since I upgraded my instrument cluster to a 996 cluster and installed the 996 oil pressure sensor, I have now more insight into the inner workings of my car

On my last two track events I noticed the following:
Sometime in the middle of session 3 or 4 the oil pressure starts to drop to around 1.5 bar (approx 20+ psi) no matter what the RPM. This has nothing to do with high G-forces during hard cornering as I usually notice the symptom at full open throttle on the straights (where else can you peek down to check the gauges?)

At the same time I noticed that the coolant temp went up to around 230 F

So I initially thought it must be an issue with the cooling system
So here's what I did:
* Replaced water pump
* installed LN engineering low-temp thermostat
* cleaned the radiators (also cleaned between the radiators and the AC condensers)
* switched from 15W50 to 10W40
* bled the coolant system twice
* checked that all the electric fans kick in
* checked pressure on the coolant lines to the front radiators

My next (and last track day of this season) is coming up this Sunday
For some reason I am worried that I will be running into the same issues again.

In case it happens again I wanted to measure the oil temp via the Durametric right after I pull off the track, to see if the oil gets too hot (I have an "S", so I have the larger oil cooler already).


So, here's the question(s):
* Is it possible that the only issue is that the oil pressure sensor itself is malfunctioning
* Anything else I can do/check ?

Thanks