After wraming up at idle the oil pressure drops to 0 but oil level is normal is this a common prob car hs 252 000km on it dont know history.

 

Probably bad gauge.

 

Verify with a mechanical gauge, but its probably the front cover o-ring. When the oil is cold and thick you have enough pressure that you read some pressure but as it warms up to much bypasses and you get no oil pressure. I wouldnt drive the car untill you verify you have oil pressure with a mechanical gauge.

 

No, usually if it is the Front cover O ring, there is pressure that drops the higher RPM there is.

A bad E-shaft thermo-pellet would cause a drop at warm.