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Hi folks,

Recently I noticed that there is a bit of leak coming from the Oil Control Valve (some call it Solenoid Valve). At first diagnose, a Mechanic advised me to just replace the seal which is sold separately and it's cheap. Did replace the seal and had to replace the valves cover's gasket as well. Turned out the leak is coming from the valve it self and I read somewhere else that it's due to the high pressure inside the engine which leads to these sort of issues. Fortunately, the leak is not that massive and no Check-Engine light has come on yet.

The question is, shall I leave it as it is and wait till it becomes worse or the Check-Engine light comes on, or shall I replace the OCV ASAP?

Any advice is highly appreciated.

Thanks,
 

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Small leaks never get smaller on their own. I'd replace it -- not on an emergency basis, but I would definitely change it out at the next reasonable opportunity.
 

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Oil never belongs outside the engine. The sooner you fix it the better.
 

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Hmm, just noticed I've got a bit of an oil leak around what I believe is the OCV as well. Is the part you replaced what I'm pointing to in the attached pic? Do you happen to know the part # and about what the part cost?

 

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So I may have the same problem that you @Scooby had. 1. Is this the OCV? 2. Does this look like a slight leak to you all? I wiped everything down yesterday but today I'm seeing this. To me it looks like some oil is seeping up past the gasket.

20180712_181735 (1).jpg
 

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I'm at 75k and had to top off the oil a couple times then found a leak at this same spot. Has anyone found a part number and replaced it yet?

I already had the dealer replace the belt tensioner and valve cover gasket due to leakage, but that was under warranty.
 

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I'm at 75k and had to top off the oil a couple times then found a leak at this same spot. Has anyone found a part number and replaced it yet?

I already had the dealer replace the belt tensioner and valve cover gasket due to leakage, but that was under warranty.

Never mind, I dug around and found it!

PE0114440A
https://www.onlinemazdaparts.com/p/Mazda__6/CONTROL-VALVE-VALVE--OIL-CONTROL/49923727/PE0114440A.html


The part isn't too expensive, but I'm sure the dealer wants $$$ for labor.
 

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I haven't changed mine and it's been seeping a hair since I last posted about this a year ago. My oil level has never changed enough to warrant adding oil so I'm leaving it alone. Is yours actually leaking enough to need to add oil? Your engine would be a hot mess I would think.
 

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It's a slow leak, but it's noticeable since my engine bay is filthy. I've noticed the dipstick level drop ever so slightly so it's not a huge problem for now. Definitely need to detail my engine bay asap lol.






 

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I keep my engine bay very clean so that is how I noticed it. The dealer replaced the OCV valve the first time, but they rushed the job and didn't properly seal the valve cover. I had to take it back so they could redo the valve coverl. Two months later, the OCV was leaking again, only worse. So I went back a 3rd time and they replaced the valve cover, valve cover gasket and OCV. So far so good.....the valve cover had to be replaced because there is a seal that the OCV sits in and I think the guy that botched the job the first time screwed it up.

I think it's more common than people realize as many folks don't remove the engine cover often enough to notice.
 

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Yep, unless it's leaking from the connector it's the seal at the valve cover.

Just be sure you don't create a bigger leak than the seep you have now by R&Ring the valve cover to change the seal! :)
 

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Unbelievable....it's leaking again. This time from the top metal part. It's when I hit the upper RPM range. Usually above 4.5k. This is infuriating. Dealer replaced it once, then again due to not sealing the VC correctly so they redid the VC. Now it's leaking from the very top as shown in the photo below. I'm about to give up on it. LOL
 

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Someone suggested it could be the PCV valve, but to check that you have to take the intake manifold off or do a vacuum pressure check.
 

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Does anyone have any suggetions on what I should do about this? Let it go? This is the 3rd time they tried to fix it. The only thing I can think of is they either never actually replaced the OCV valvethe second time around or the crank case vacuum pressure is not right due to a clogged PCV?
 

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Does anyone have any suggetions on what I should do about this? Let it go? This is the 3rd time they tried to fix it. The only thing I can think of is they either never actually replaced the OCV valvethe second time around or the crank case vacuum pressure is not right due to a clogged PCV?

Sorry to hear that it's still leaking. I'd leave it alone at this point since it's such a small leak. My OCD kills me to see oil leaking, but I'll just wipe it down after every oil change.

I wonder how the newer 2.5T will leak at this same spot unless Mazda has addressed it somehow.
 

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Yep, unless it's leaking from the connector it's the seal at the valve cover.

Just be sure you don't create a bigger leak than the seep you have now by R&Ring the valve cover to change the seal! :)

Yea that's reason enough to leave it alone as long as the valve isn't defective. I wonder why they don't have it mounted like other manufacturers like Toyota and Honda where it's accessible without taking off the valve cover? lol
 
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