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Oil in air breather tubing #4110089 05/29/16 10:06 PM
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Nissan101 Offline OP
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So recently i notice that there is some oil in the valve cover breather hose. The car isn't smoking blue and the oil level haven't decreased noticeably. Can it be a bad PCV valve?


Nissan N16 -10w30
Nissan S13 -20w50

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Re: Oil in air breather tubing [Re: Nissan101] #4110149 05/29/16 11:46 PM
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CT8 Offline
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How many miles are on the engine and it is blow by which is oil vapor, gasoline and other combustion by products which includes lots of water. Could it be the PCV valve ? I don't know but when is the last time it was changed?

Re: Oil in air breather tubing [Re: Nissan101] #4110150 05/29/16 11:49 PM
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TiredTrucker Offline
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There will always be some oil residue in the PCV side tube, as it is the primary draw of crankcase gasses and oil vapors to the intake manifold, and quite frequently in the "clean side" tube that goes from the valve cover to the intake body before the throttle body. Normally, the clean side just supplies clean air from the intake to the valve cover to compensate for PCV side being drawn into intake manifold. But under some conditions, like full power WOT events, there can be a draw backwards of CC gasses thru the clean air side. That can oil up the clean side tube a little. This occurs with new engines as well as old worn engines.

All of this is the primary motivation that some install oil filtration "catch cans" on the PCV side, and check valve equipped clean side oil separators.


Freedom is not about having the choice to do what you want, but the choice to do what you ought.
Re: Oil in air breather tubing [Re: Nissan101] #4110177 05/30/16 02:27 AM
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Marco620 Offline
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Sounds like pcv valve. Clean or replace and add a pea based fuel cleaner to tank and keep an eye on it.


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Re: Oil in air breather tubing [Re: Nissan101] #4110181 05/30/16 02:53 AM
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speedysmitty Offline
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If it's a concern to you or if you have a turbocharged engine you can install an oil catch can.

Re: Oil in air breather tubing [Re: Nissan101] #4110182 05/30/16 02:58 AM
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Tegger Offline
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Originally Posted By: Nissan101
recently i notice that there is some oil in the valve cover breather hose.

Is the oil in the skinny hose leading to the big intake hose, or is it in the big intake hose itself?

Pull the big hose off the throttle body, peek into the big hose with a flashlight, and note the extent of the oil inside, if any.

Feel the throttle body bore. Is it dry or oily? Open the throttle plate and feel the carbon on its backside. Dry or oily? Feel the carbon on the throttle bore. Dry or oily?

If there is little to no oil in the big intake hose, and the carbon is dry or only slightly tacky, then there is no problem.


2013 Toyota RAV4 - 88,000 miles - Toyota 0W-20, Toyota filter
Re: Oil in air breather tubing [Re: Nissan101] #4110214 05/30/16 05:32 AM
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Olas Offline
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To avoid ingesting oil which lowers octane, displaces AF mix and leaves a mess everywhere, run those two hoses to your exhaust. Problem solved smile


Cable ties should hold it
Re: Oil in air breather tubing [Re: Nissan101] #4110242 05/30/16 06:26 AM
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Nissan101 Offline OP
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This engine have a total of 65 000km on the odo.


I bought the car used, and the oil was in a bad condition.


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Re: Oil in air breather tubing [Re: Tegger] #4110244 05/30/16 06:27 AM
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Nissan101 Offline OP
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The throttle body bore is dry, there is not oil.


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Re: Oil in air breather tubing [Re: Nissan101] #4110279 05/30/16 07:27 AM
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Olas Offline
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Run both sides to the exhaust


Cable ties should hold it
Re: Oil in air breather tubing [Re: Olas] #4110297 05/30/16 07:49 AM
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Oldmoparguy1 Offline
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Originally Posted By: Olas
Run both sides to the exhaust

That is worthless information unless the OP knows how to do it. That is not a trivial modification and is technically an illegal change to an exhaust system in the US.


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Re: Oil in air breather tubing [Re: Nissan101] #4110316 05/30/16 08:09 AM
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Olas Offline
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I never said that wasn't so, but it doesn't change the fact that it will solve several of the problems currently being experienced.


Cable ties should hold it
Re: Oil in air breather tubing [Re: Nissan101] #4110323 05/30/16 08:18 AM
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Tegger Offline
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Originally Posted By: Nissan101
The throttle body bore is dry, there is not oil.

Then there is no problem.

There will always be a little bit of oil film in the breather tube, some of which may seep onto the surface of the big intake pipe at the point where the breather joins it.


2013 Toyota RAV4 - 88,000 miles - Toyota 0W-20, Toyota filter
Re: Oil in air breather tubing [Re: Tegger] #4110611 05/30/16 03:03 PM
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MrAnderson Offline
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Things like that happen, eventually. You can only suck oily vapor out of an engine for so long before it starts to accumulate in whatever you're sucking it through.

To get rid of the built up residue, replace your PCV valve, the hose, and the filter, if it has one, that is in the other end of the hose.

In the ever-expanding field of emissions reduction, it seems some cars now have an air/oil separator. Like this one: http://www.summitracing.com/parts/mor-85...vSdTxoC1_7w_wcB

There are universal air/oil separators, and there are some designed for specific vehicles. Personally, putting one of those on a vehicle that didn't come with one seems like a solution in search of a problem.

Re: Oil in air breather tubing [Re: Oldmoparguy1] #4110612 05/30/16 03:04 PM
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MrAnderson Offline
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Isn't that what they did after draft tubes but before PCV valves?

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