I noticed my 992 C2S oil pressure fluctuate between twenty-nine to high thirties while on the highway and holding a steady 1,900 rpm in 8th gear. I have never seen this fluxation before, but I usually don't watch the gauges for more than a second, so I may have missed the fluctuation in the past. Is the oil pressure fluctuation normal?

 

Yes, it will fluctuate.

 

Completely normal.

 

It has a variable output oil pump you’ll notice when you go up hill the oil pressure will increase even though the rpms stay the same because his senses an additional load.carl