[Schulisco]

@Funracer Totally agree.

And I just want to add the fact that adding the intermediate pieces for the hydraulic cam tensioners also brings a noticeable drop of oil temperatures! Believe it or not. But they will.
This mod together with the Carrera oil radiatior brings the biggest drop on oil temperatures on an aircooled 911. No question that the rest of the engine must work perfectly (cooling fins of the cylinders are free of dirt, engine oil cooler not clogged for cooling air, thermostat works, ignition is in spec all the way etc.
Further reading:
https://forums.pelicanparts.com/porsche-911-technical-forum/1141941-too-low-oil-pressure.html#post12186643
On page #2 of this thread I posted an excerpt from our hosts 911 engine book with a comparison of the diameters committing the effects of them.
If you search with the parts numbers you'll another threads on this too.

Thomas