On Tue, 06 Apr 2010 09:36:32 +0200, Philippe
wrote:

Hello,

is anyone may confirm some type of crankcase internal crack cause oil
pressure drop?

thanks

drain the oil and take the football off the bottom of the engine (oil
sump) and have a look up inside using a thousand candle power
spotlight. you can see it all before you.
you just need to have a new gasket available for the sump to engine
joint.

as to the question. havent experienced it with my O-200 but with the
spotlight and an inspection mirror you should be able to confirm the
suspicion or put your mind at ease.

Stealth Pilot