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Thread: Oil catch can

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    Oil catch can

    Has anybody installed oil catch can in their 2.0 petrols...?

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    Not sure of the 2.0 but the 2.5 already has a catch can. Putting on another one isn't necessary.

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    Registered Member concept's Avatar

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    The 2.5s have a factory catch can?
    2014 3S GT, Deep Crystal Blue, Eibach Pro-Kit, Enkei PF01s, Koni Sports, Pirelli P ZERO ALL SEASON PLUS tires, 225/45/18
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    Quote Originally Posted by MyFirstMazda View Post
    Not sure of the 2.0 but the 2.5 already has a catch can. Putting on another one isn't necessary.
    What? Since when?
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    Quote Originally Posted by MyFirstMazda View Post
    Not sure of the 2.0 but the 2.5 already has a catch can. Putting on another one isn't necessary.
    It's not a catch can, it's an oil separator installed at the PCV valve. It basically catches engine blow-by and allows oil to drain back into the engine and everything else to go back into the intake manifold. Adding a catch can is like adding an extra filter. For some people it isn't necessary, and for others it can help quite a bit. It all depends on your climate, your commute and your driving habits.

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    And your oil. 0w's are more likely to blow by in DI engines.
    There is a a lot of good content about it on YouTube.

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    Quote Originally Posted by Chris_Top_Her View Post
    And your oil. 0w's are more likely to blow by in DI engines.
    There is a a lot of good content about it on YouTube.
    Trying 5w30 on my current oil. See what it looks like after.
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    Quote Originally Posted by MyFirstMazda View Post
    Not sure of the 2.0 but the 2.5 already has a catch can. Putting on another one isn't necessary.
    The factory separator dumps it right back into the system.. there is no catch can built in. 2/2.5 use the same components
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    Well, oil separator to get the oil out. I haven't seen anyone having problems from carbon build up on valves and there are people who have driven over 100K miles. There will be carbon, even non DI engines got carbon build up over time. For those with an after market catch can, I would be curious what is caught and how much caught when driving normal conservative vs driving fast and aggressive.

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    Quote Originally Posted by Chris_Top_Her View Post
    And your oil. 0w's are more likely to blow by in DI engines.
    There is a a lot of good content about it on YouTube.
    Take this video with a grain of salt. The narrator is not a mechanic and non of his cars needed a valve cleaning. He says that you might need a valve cleaning every 30K miles and if you don't you will get poor gas mileage, loss of horse power, miss fires and the check engine light will go on and the engine will give high emissions. He is repeating what he has read or heard else where. Mazda's will get some carbon too and I'm not against installing a catch can but for me personally, I'm not going to install one.

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    Registered Member Conrad 16.5's Avatar

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    Quote Originally Posted by Chris_Top_Her View Post
    The factory separator dumps it right back into the system.. there is no catch can built in. 2/2.5 use the same components
    "Don't bother me with facts, Son. I've already made up my mind." -Foghorn Leghorn

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    I agree with the comment by MyFirstMazda: When viewed in the MAZDA schematic, I see an oil separator which preforms as a continuously emptying catch can. A real improvement over the add-on catch cans that need to be disassembled to empty. Ed

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    Quote Originally Posted by MyFirstMazda View Post
    Well, oil separator to get the oil out. I haven't seen anyone having problems from carbon build up on valves and there are people who have driven over 100K miles. There will be carbon, even non DI engines got carbon build up over time. For those with an after market catch can, I would be curious what is caught and how much caught when driving normal conservative vs driving fast and aggressive.
    Like you said, carbon build-up is pretty much an eventual thing all car owners will have to deal with if you keep the cars long enough or drive them a certain way for a long enough time.

    The oil separator delays the carbon build-up cleaning by catching most of the blow-by. An aftermarket catch can attempts to catch the blow-by before it makes it to the oil separator. If anything, theoretically an aftermarket catch can will extend the lifecycle of the OEM oil separator just by taking on some of the "load". That in itself is worth the $25-$100 and 20 mins install time to me.

    In case there's any confusion, blow-by is produced when the engine is not at operating temps. More blow-by is produced in climates with high humidity. This means that if your commutes are short enough that the engine doesn't reach operating temps, it will not be hot enough to burn off the excess blow-by. This is why aggressive driving helps, it gets the engine to operating temps faster.

    Here are pics of the blow-by caught by an aftermarket oil catch can on Silly Wabbit's CX-9. This was 2k miles after the installation.



    Chris_Top_Her also has an oil catch can installed on his 2.5 NA and he has mentioned before that he catches "a lot of blow-by".

    Quote Originally Posted by erhayes View Post
    I agree with the comment by MyFirstMazda: When viewed in the MAZDA schematic, I see an oil separator which preforms as a continuously emptying catch can. A real improvement over the add-on catch cans that need to be disassembled to empty. Ed
    The only difference between an oil separator and a catch can is that the catch can needs to be manually emptied. If one "filter" works well, and a second "filter" can be added without any impact to "flow", then the second filter helps much more than it hurts. Thus the aftermarket catch can is an improvement to the existing system.
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    Quote Originally Posted by MyFirstMazda View Post
    Take this video with a grain of salt. The narrator is not a mechanic and non of his cars needed a valve cleaning. He says that you might need a valve cleaning every 30K miles and if you don't you will get poor gas mileage, loss of horse power, miss fires and the check engine light will go on and the engine will give high emissions. He is repeating what he has read or heard else where. Mazda's will get some carbon too and I'm not against installing a catch can but for me personally, I'm not going to install one.
    While it's true that you may never need a valve cleaning, I wouldn't rule it out completely. I had a 1991 Honda Accord with over 200k on the engine. I had put half of the mileage on the engine myself, and by all accounts it seemed to be perfectly fine - ran smooth, decent mileage. I did a Seafoam cleaning (essentially a chemical cleaning of the intake valves) before an oil change, as recommended by my uncle (a mechanic, now retired). Immediately I noticed better engine response, and also noticed better mileage. The point in this story is that while a cleaning isn't required, sometimes it can help, even when you aren't seeing any major symptoms. All a catch can does is delay having to do that cleaning even longer. It helps to prolong the efficiency of the engine.
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    Quote Originally Posted by sm1ke View Post
    While it's true that you may never need a valve cleaning, I wouldn't rule it out completely. I had a 1991 Honda Accord with over 200k on the engine. I had put half of the mileage on the engine myself, and by all accounts it seemed to be perfectly fine - ran smooth, decent mileage. I did a Seafoam cleaning (essentially a chemical cleaning of the intake valves) before an oil change, as recommended by my uncle (a mechanic, now retired). Immediately I noticed better engine response, and also noticed better mileage. The point in this story is that while a cleaning isn't required, sometimes it can help, even when you aren't seeing any major symptoms. All a catch can does is delay having to do that cleaning even longer. It helps to prolong the efficiency of the engine.
    Isn't something like Seafoam not really going to do anything for a DI engine? I had heard that, but wasn't sure.
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