So, I have this observation - wondering if others have seen it and what might be the cause. Sometimes on or just after take off, my oil pressure drops. Often to the point that it triggers the conservative oil pressure warning light and that gets my attention. Maybe the trend happens all of the time but the oil pressure doesn't get low enough to trigger the warning - I just don't know.

Here's what it looks like:

Oil pressure trend small.jpg
Although the graph is barely readable it shows the drop and recovery and then things are relatively stable for the rest of the flight.

Any ideas or is this normal? In my wildest imagination I can't think of what would cause this in a dry sump engine.