When I say a cold engine it is never below 35 degrees F. More typically 35-60 degrees F.
When the pressure drops it is more sudden than gradual. Specifically I start the engine, within 5-8 seconds the Oil Pressure rises. The gauge goes to full maximum on the VDO panel gauge. I let the engine idle for concern of stressing bearings with over pressure. After a short warm-up, oil temp just a little below 50 degreed C and water temp around 60-80 degrees C, I slowly advance the throttle and at a point around 1,500 RPM prop speed the oil pressure will drop right into central of the operating pressure.
Important to note: I am running MoGas not 100LL. I would never recommend 100LL on a 914. The lead buildup and 'coking' is very problematic. I've had to declare an emergency more than once due to 'coking' blocking the turbo oil sump and then blowing all the engine oil out the turbo bearing.
I think you are not correct on the turbo blowing it’s oil out, i had exactly the same problem on my 914, It’s not the lead from 100 LL that is contaminated your oil, It’s the oil it self! I used the Aeroshell semi synthetic oil with the occasional use of 100LL when mogas wasn’t available,
What happens is the oil return lines run over the top of the turbo and below the exhaust down pipes, when you shut down a hot engine the oil stops moving and is then cooked in the pipes causing carbon to build up,
Since my emergency i have cleaned the turbo sump and return pipes and used heat sheald tape on the pipes, also have changed to the full synthetic Mobil 1 racing motorcycle oil that has a much higher temperature tolerance then the semi synthetic oil i used to use,
It’s important on the 914 to let it idle for a couple of minutes before shutting down to allow oil / turbo temperatures to drop,
i used no more than 10% 100LL against 90% mogas on my engine and still had the oil return pipe block with crystallised oil,
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