I posted a message a couple of days ago about crankcase pressure on my 87 B230. The responses bring some additional thoughts to mind. I will install a new flame trap element although the old one is not plugged. I did remove the oil seperator that flame trap sets on and its clear. Since my post the other day I have determined that the hose that runs into crankcase from oil seperator is open. I did this by plugging one flame trap hose and blowing into other. At first I could not get any air to pass through flame trap but when I loosened oil fill cap I found I could play that b230 like a Sweedish? horn!! One response spoke of excessive blow-by due to ring wear. I just bought this car so do not know any history. The odometer is stuck at 198,000. I did drive car from Houston to Denver after purchase (1000 miles) and it did'nt use any oil on that trip, although it does leak out oil fill cap. My new questions are - 1. If excessive crankcase pressure is the problem would'nt it burn some oil? 2. A few months back there was a discussion on board about oil seperators filling up with gunk and freezeing. The recommendation was made to remove oil seperator and flame trap and plumb in an old fashioned crankcase breather that vents into the atmosphere (emmisions nightmare). At the time I wondered what that plumbing job would look like. Now I can see if I left the oil seperator on car it would be as simple as some heater hose and a 90 degree elbow. Would this removal of flame trap allow good enough flow to take pressure off of crankcase if blow-by was the cause? 3. One response mentioned changing the gasket on oil filler cap. When I look at my gasket I notice a small nick that could let some oil past. I would want to make sure I did'nt have excessive pressure before installing a gasket as I could then blow -out front or back seals in motor. Don Foster and others have mentioned a homemade tool that would measure crankcase vacumn. Is the tool actually a fill cap that has been drilled and tapped to accept a vacumn gauge?? What should this vacumn reading be?? Enough of my long winded ramblings, thanks to all for response's and wishing all a good turkey day.