I've never had a car with an oil pressure guage before :-) I'm a little confused about the behavior and what is normal. It seems like pressure is related in 2 ways.

1) Temperature of the engine. The colder the engine, the higher the pressure.

2) RPMs or throttle. Higher means higher oil pressure.

#1 has precedence over #2. I THINK this is how it works, can somebody confirm this? The manual said that 3.5 was normal at 5k RPM... but i found it weird that when i turn on the car, the guage is maxed out. Thanks in advance.

 

All Normal symptoms...

Oil pressure is higher when cold due to the simple fact that the oil in the engine/oil pump(s) is slighty 'Thicker' at lower temps.

It is not a good idea to rev/load the motor up when still cold due to this very reason, where the oil has not come up to operating temperature and does not quite lubricate as well.

Higher/Lower engine speeds will vary the oil pressure, as the oil pump(s) within a motor vary their speeds in symphony with the engine (as they are driven off the engine itself). Usually the design of motors take this into account and it is perfectly normal.

At low RPMs, motors do not require as much oil pressure for correct lubrication and cooling, but when the loads/RPMs are raised then they generally require more oil pressure to maintain correct lubrication of the internal components.