I suppose to improve blow-bye evacuation. The car has 63k on the clock and the rubber piping is hard/solid and I'd say in good shape but I admit I cannot see what's inside. Since the #6 revision did not stay for very long I conclude it wasn't much help to the sludge problem and as far as I can tell the increase to the little hole in the outlet from the oil catch vessel seems to be about it. I concluded that the evacuation from the dip stick vessel might be of some help, hence my proposed top only change. What do you think? I bought new original style tubing as well just not the tube with the check valve in it.
It's a 2001 and I have no maintenance history. My oil changes are synthetic 5W30 and 5W40 Euro spec. My thoughts are preventive since I use it daily but just short journeys.
I suspect there will still be blow by but the job is to get it to the turbo input. I feel the lack of flow/partial blockage in the pipe and to the little hole in the catch can is what causes the problems.
Yes thinking of normal engine blow by, pipe age and sump sludge from what might be shed from soft old PCV piping. I find it difficult to imagine that much positive turbo pressure really needing the additional check valves in the #6 system. My aim is not to take off the sump too soon for cleaning and prevent the leaking oil from the known points dripping on to my garage floor - with the help of the synthetic oil for high mileage engines. That's the plan - I'm getting on and it's not so easy getting under these days.
Well I had another clue, and it was spots on a piece of card under the car after driving about 50 miles and keeping my foot off the accelerator to maintain a zero boost situation or the boost control was dumping the pressure created by the turbo. It was then I realized the reason for the check valves in the #6 PCV hoses since the pressure must have been going back to the crankcase and + ve pressure = oil leaks.
