Oil pressure warning for 1 year

Peugeot 308 2013 1.6 hd diesel of the vehicle last year 24 10 2021 I had the vehicle maintenance done, there was no problem, I left home 1 day later, the warning of stop oil pressure problem was seen in the vehicle, I went to the place where I had the maintenance done, I explained the situation, they said it might be from the oil sensor or the oil filter we installed may not be original, they said, so I got in the car. intermediate oil pressure warning came after the weather got cold5 6 months no warning came again when the weather started to warm up warning I thought it would get better when I did the maintenance I had the oil filter installed 2 3 times the original gives the same warning oil pressure problem in the car no sound in the engine no, my mechanic says, let's change the cooler, oil pump, and sump in all 3, he doesn't know the problem, so I'm stuck in the middle, I'm glad to solve the problem or have an idea and knowledge, thanks

When did you get the warning? On sharp turns, the oil in the cartel can pile up to one side. In this case, if the oil pump cannot draw enough oil, it may give a pressure warning. I also suffer the most in terms of fat and oil. I get level reading errors after fast and aggressive driving (Oil --) Still, I think it will be enough to have the oil pump checked. If there is no blow to the crankcase, if there is no deformation, I think there is no need to change it. Maybe it can be removed, cleaned and replaced. From time to time, iron dust caused by wear may damage the filter, etc. if there is no magnet in the cartel.

I get it when I start the car for the first time, and it does it in hot weather in summer, and it has never done this for 1 year and 6 months in cold weather