Oil pressure sensor - Toyota Corona, 2.0L, 1993

At cold start, the subj lamp is on for at least 7 seconds!
Today it burned for a very long time, I didn’t wait - I did it. Started up again - does not burn, what the hell?
I have already changed 2 filters, the level is normal.
It all started after changing the oil (for the same one) I
'll go today and change it for a new one, can I get a skiff for him?

UPD The sensor was normal, the oil pump was not pumping well. Well, plus the oil is fake, I poured in the barrel neste 10w40, it burned less in time.