m3 evo oil leak

[puncturewound]

recently had the 3 serviced and my mechanic informed me theres a slight oil leak coming from a bolt on the back drivers side of the block. the leak seems to be getting worse and im dropping it back to him this weekend to have it sorted. Does anyone have any ideas what this bolt is? perhaps a place to attach a oil pressure guage?
It only seems to be leaking when the motors running!

[GTV6M3]

I believe thats the constant pressure valve..

I fixed mine using the seal from the oil cooler pipe - see http://www.bmwowner.com/forum/viewtopic.php?t=9016...
4 months on and no leak :-)

[puncturewound]

hey thanks for that, ill register on e36 and check it out, much appreciated!!!

[puncturewound]

thanks for that, sorted now, top tip!!!