My son's 1987 740 has a problem with the engine slowly puking out its oil out of the filler cap in the valve cover. This symptyom appeared after I had my friend/mechanic install a new flame trap and a new engine wiring harness. I consulted this board at the time and it was the general consensus to look at the flame trap so I asked my mechanic to check on the flame trap and he said it wasn't clogged (it was brand new). My mechanic said he didn't know what could be causing the problem and it was left alone. At the time the car had 160k miles. Today we were looking at a different problem and noticed that the oil "blowby" problem has worsened. We removed all the air intake hoses from the air filter box to the throttle body and found that the hoses had a lot of oil in them, the throtle body had a pretty good coating of oil also, as did the entire other side of the engine it has a thick coat of oil from the valve cover down to the oil filter.
We removed the flame trap and it was oily but not clogged. The car now has 175k miles.
Any ideas what could be causing this problem?
Thank You
Jorge