['88740GL]

Ever since i bought my volvo (first volvo) oil has seeped from oil filler cap, onto the rocker case and slowly seeped down the engine block, onto the clutch bellhousing and drips onto the floor, not much, but enough for me to be having a dirty oily patch on the drive, i've hear of a flametrap, but under all those hoses, i can't seem to find it, i know it must be there and be blocked as when the engine is running blowby gases come out of the dipstick tube if i remove the dipstick.....any ideas where it is and tips on removing and cleaning it?

thank you!