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Discussion Starter · #1 ·
I am working on a plan to install a oil bypass filter system in my car, 2015 Eco. I want to use an aftermarket flat filler cap IOT install the return swivel connection. Turns out somewhere along the way, GM installed a baffle type of adapter and installed a different filler cap compared to the 2011. Research has lead me to believe that the Gates 31291 or Stant 10140 will easily fit on 11 - 12, and likely all the way to my 2015 if I toss the baffle and cap.

I want to know why GM installed the baffle shown here, and if anybody replaced said baffle and or cap with the Stant or Gates items listed above.

Who knows, maybe somebody dressed up the engine with a shiny aftermarket cap.

Thanks in advance.
 

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The early design depended on the cap and seal to be correctly seated and in perfect condition or else oil will escape.

Try removing the cap with the engine running......make sure you have goggles and a towel because the cam will throw oil as fast as you can wipe it off......between that and the positive/negative pressure that 4 bangers create (2 pistons rising, 2 pistons falling with two experiencing blow by) quite a oil storm will erupt.

The baffled extension that was installed for the 2014 model year keeps the raw oil spray from directly hitting the cap base, but if removed while running, it will still blow raw oil out since you created a blow by escape path.

Might help with your project though.

Rob
 

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The early design depended on the cap and seal to be correctly seated and in perfect condition or else oil will escape.

.

Rob
That explains what I've been seeing on the totaled '15 Cruzes I've been look at. I just bought a valve cover last month for a '12 and it didn't have the extension. Anybody have the part #. After I changed the cover, I smelled burning oil. It appeared to spray out of the cap. The intake has the typical bad check. I'll change that soon for about $300.
 

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Discussion Starter · #4 ·
Try removing the cap with the engine running......make sure you have goggles and a towel because the cam will throw oil as fast as you can wipe it off......between that and the positive/negative pressure that 4 bangers create (2 pistons rising, 2 pistons falling with two experiencing blow by) quite a oil storm will erupt.

Oh great, somebody did that and got hurt with a face full of hot oil..... sounds like a life lesson to me. Equates to touching the plug wires while the engine is running, just something that aware people don't do.
 

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Discussion Starter · #5 ·
That explains what I've been seeing on the totaled '15 Cruzes I've been look at. I just bought a valve cover last month for a '12 and it didn't have the extension. Anybody have the part #. After I changed the cover, I smelled burning oil. It appeared to spray out of the cap. The intake has the typical bad check. I'll change that soon for about $300.
there are two extra parts and likely a different oil filler cap from the 2011, I have a feeling that the 2015 valve cover includes the extention baffle and ring lock.

The number on the extention is 55593202, but does not come up as an available part. there is also a locking ring that fits down over it I can not see a part number on it.
 

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there are two extra parts and likely a different oil filler cap from the 2011, I have a feeling that the 2015 valve cover includes the extention baffle and ring lock.

The number on the extention is 55593202, but does not come up as an available part. there is also a locking ring that fits down over it I can not see a part number on it.
I bought the assembly. Would you post a close up picture so I can see how to properly orient the locking ring?
 

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there are two extra parts and likely a different oil filler cap from the 2011, I have a feeling that the 2015 valve cover includes the extention baffle and ring lock.

The number on the extention is 55593202, but does not come up as an available part. there is also a locking ring that fits down over it I can not see a part number on it.
Yeah I kinda wanted to update just because of the cap and possible PCV update.


I bought the assembly. Would you post a close up picture so I can see how to properly orient the locking ring?
You buy the extension or the whole cam cover assembly?

GM Parts Direct: Your direct source for Genuine GM Parts
 

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Discussion Starter · #8 ·
I will take a picture later today and post it. However I do know that the extention and locking ring are keyed and that there is a flat tab that is oriented down and is inline with the front face of the engine valve cover.

Just found an image.. Care of WOT Tuning on the internet.

Capture oil filler cap.PNG
 

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It's just the cap, extension, and locking ring. List is about $27. The extension is a tube with flappy baffles inside to knock down any splash. Also the o-rings seem much tighter than the OE cap. Obviously this all addresses an issue that at least some cars were having.
 

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Discussion Starter · #10 ·
I just ordered a STANT 10140 cap. I am hoping that it has flat surfaces so that I can install the bypass return swivel connection into it. But something makes me think that I will have to ditch the original three piece cap assembly.
 

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there are two extra parts and likely a different oil filler cap from the 2011, I have a feeling that the 2015 valve cover includes the extention baffle and ring lock.

The number on the extension is 55593202, but does not come up as an available part. there is also a locking ring that fits down over it I can not see a part number on it.
The new cap assembly is 55593201. It comes with the cap and tube with locking ring. The ring snaps down after installation to prevent the tube from spinning out when the cap gets removed. The o-rings are huge on both pieces, and the cap won't interchange with old style cap.
 

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Discussion Starter · #12 ·
I see that it is keyed differently when I first looked, but removing the baffle, locking assembly should get me to the original oil filler cover of previous model years. Thankfully it is a warehouse stocked part so no restocking charge if it does not work out.

I should have it Tuesday.
 
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