hi i have small weep from the oil cap on my 318ci is it just a worn out seal or could this be the start of a crank case vent valve problem? i only use the car to go to work and back and it just gets time to warm up... there for it has all the normal n42 features of a gunky oil cap and rust dip stick etc etc (only condensation as the oil does not get time nor hot enough to burn off the condensation. this only appears in the cold weather) could the "gunk" have got into or blocking the cvv valve/pipes and as a result back pressuring the oil fill cap and causing the oil to be pushed out? it started as a leak from a service i had done a while back. they kinked the seal on the oil filter and it was leaking from there i ignored it and left it for 2/3 months then yesterday i took it apart re fitted the seal and it has stopped leaking.. but since i have done that the oil cap has started weeping making me think a back pressure problem. has this car got a cvv and where is it or is it just a poor oil cap seal?