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I had this problem for 10 years. Only leaked when parked for a few days.
I first put a rubber hose on the vent pipe and brought it up higher so
it would have to go farther before it came out. That helped some. I
got a one way valve from volvo for the oil line that goes to the raditor.
That helped some, but when I had the xmission rebuilt this time at 200k
we discovered that volvo doesn't put a valve in one of the lines comming from the raditor. We added a spring and ball in the valve body and it
hasn't burped since. I have pictures of where it goes if you want I will
send to you. We figured this out from a manual for a ford capri that
uses a bw35.
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