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Old 07-08-2019, 11:41 PM
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Join Date: Jun 2014
Location: Omaha, NE
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cn90 is on a distinguished road
I did this mod and it works great, zero oil consumption, so no complaints.

Question re decommissioned system...

1. I leave the Oil Trap alone b/c it is not sucking any oil or any air (I blocked the end of the hose where it joins the valve cover).
So is it OK to leave the Oil Trap in there "forever"?

2. The Return Hose ---> Dipstick Housing, this hose can break with time but since the Oil Trap is decommissioned, is there any harm of ignoring this hose? Let's say it is broken but you ignore it, any issues?
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2006 E53 X5 3.0 6sp MT
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Old 07-22-2019, 02:02 PM
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Join Date: Mar 2018
Location: Ventura, VA
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geobrick is on a distinguished road
Status Update

I've got 2,228 miles on the car after the CVV removal and it looks like the oil's down about a 1/4qt.

I still haven't replaced the valve cover gasket which I suspect has a leak. I don't see any oil on the ground yet but I do smell burning oil in the cabin after long periods of highway speeds at about 70mph (after exiting the highway or slowing in traffic). That could be a contributor to the 1/4qt drop. Either way it's a huge improvement over what it was before removing the CVV.

Last edited by geobrick; 07-22-2019 at 02:38 PM.
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ccv, oil separator, pcv, vacuum, ventilation


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