Oil - the never ending story

[Helmuth]

Hello guys,

long time no speech - which means nothing broke ......
only 4 brake discs, 3 hinges (Traggelenk?) and both back shocks

Now something where I really have no idea.
When driving in the mountains - oil somehow hot and engine in idle the oil pressure light is sometimes flashing.
Because of that I had oil pressure measured - it was on 1,2bar in idle, seems to be OK.
Nevertheless I had the oil pressure sensor changed.
But the problem is still here - oil hot and idle -> oil pressure light is flashing and to be honest I really do not like that.

The only thing that comes into my mind:
All former oil changes were done by a BMW garage and they used 0W40 LL04 oil. The indy who did the last oil change used eni i-sint 5w30 which is also LL04 certified.

I have read several oil threads here but did not find an answer for the question: can this be the culprit?

Thank for thinking about my problem.

Helmuth