Transient oil temperature concerns

I have doubts that my engine oil temperature sensor is telling me the truth. The reason for my concern is that the oil temperature rate of change, both up and down, seems far too quick for such a fluid.

I'm running a Bosch combo pressure/temperature sensor in an oil filter sandwich plate on a Honda K24 engine. It's specifically placed in a chamber that is post oil cooler (when the oil stat is closed), which is fed from the sump via the pump. So in theory it's oil straight from the sump via the cooler (albeit it travelling through the crankcase).

Below is a rough trace of what's happening - under WOT the oil temperature is increasing as rapidly as the engine speed increases, and then almost instantly recovers to the 'baseline'. In fact I see a 8C increase in oil temp in just 200ms after the throttle is opened. This doesn't feel right to me.

For what it's worth, the sensor is approx. 100mm away from the turbo manifold.

Thoughts?

[img="blob:https://www.hpacademy.com/938e000f-c0ff-494e-9d67-77106683a4a5" alt="" alt="" width="1000" height="1139" ]

I've used hot pink on the top chart as a theory to what my true oil temperature is.. the basis for this is oil should not have faster temperature transients than coolant..