Oil sensor(?) change help needed

Curiosity what oil did you use ? And how long since the last change in miles ?
Last time 3-4k ago but I didn't change the oil filter then, so it got dirty very quickly, which I did now.
The oil is this one and on good price too:

Question remains the same: shall I change the oil pressure sensor if the bottom hope looks 2-3times bigger?
 
On an Audi 80 I had the oil pressure warning would keep dinging while driving. I asked a mechanic I knew and he loaned me an oil pressure tester. Oil pressure was ok. The garage I used said it was a problem with the instrument cluster which needed replacing at an exorbitant cost. I said I know the oil pressure is ok so the problem is the instrument cluster simply thinks it was wrong. He agreed. I then asked if he could simply connect the oil pressure sensor to a light on the steering column which he did saving me hundreds of pounds. The car did another 150,000 miles like that. - The moral of the story is get the oil pressure tested if it is ok it lifts a weight from your mind. Personally I think the size of the hole is not an issue I would be worried about compared with the actual oil pressure.
 
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