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Thread: SkyActiv Oil Analysis Thread

  1. #1
    i-ACTIV AWD Aficionado Kedis82ZE8's Avatar
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    SkyActiv Oil Analysis Thread

    A dedicated thread was mentioned for oil analysis tests so I will start this thread off with mine. I realize there are numerous other threads with oil reports. Hopefully this one will be easier to find.

    Just came in about 10 minutes ago.

    Looks overall good to me

    What are thoughts on the higher viscosity?

    I did change on cold motor and at around 1/3 of a drain I took sample

    I sure wish the pre-'16s allowed for the extended drain intervals.

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  2. #2
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    Thank you for posting this. My report should follow in a month or so.
    You should post the report on BITOG too. I bet you'll get many valuable opinions from oil enthusiasts and experts in a short time. UOAs on that oil aren't very common there yet, nor are the reports for Skyactiv engines, so this would be a valuable contribution.
    I'm sure you've read them before, but there are articles on bobistheoilguy.com forums that help deciphering the numbers that come out in the report.
    By looking at relatively low fuel dilution, I assume you drive mostly highway? I bet mine will be much higher. This didn't affect your wear numbers regardless.
    Quite often Blackstone ' s TBN numbers and universal averages are quite off, so this might be the reason for "higher then normal" viscosity numbers. Don't worry about that.
    Speaking of fuel dilution, there is a very interesting thread on BITOG that goes about the formula Skyactiv + premium fuel = no fuel dilution. Backed with UOA data too. Interesting. I plan to check that theory with my UOAS over time too.

  3. #3
    i-ACTIV AWD Aficionado Kedis82ZE8's Avatar
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    I'll post the link to my BITOG post here. I didn't have an account there so waiting for admin approval.
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    How many months on oil?

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    i-ACTIV AWD Aficionado Kedis82ZE8's Avatar
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    A week shy of 6 months

    75% highway / 25% city
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    Thank you so much for creating this thread. Is this using OEM filter? I hope we can get others to participate as well so we can gather more data and geek out a bit. I am almost at 4K mi and will change my oil at 5K. Will be replacing with mobil 1 and MoS2 additive from Liqui Moly as stated in another thread. Kedis, I hope you will be sticking with the Mazda Moly for awhile!

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    i-ACTIV AWD Aficionado Kedis82ZE8's Avatar
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    OEM filter and plan to stay the course with Mazda moly oil as well. I have one more kit in garage before I order more kits from Med Center to qualify for free shipping.
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    In regards to the high viscosity, quite odd. According to some of the post from BITOG, its suppose to have one of the lowest viscosity ratings in the 0W20 group. I dunno when you last started the engine and ran it up to operating temp before changing, but maybe (uneducated guess here) there was moisture build up? Seeing as how you live in WA and all, it is a wetter climate than say Arizona.

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    i-ACTIV AWD Aficionado Kedis82ZE8's Avatar
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    It was overnight from a previous 25 mile drive. I put it up on ramps in garage after this drive, turned off vehicle and changed oil the following morning without starting motor.

    On a side note for those that don't know you can obtain the Blackstone kits free from here:

    http://www.blackstone-labs.com/free-test-kits.php

    You pay for postage to send it in and when they test. I just put postage stamps on the plastic bottle and dropped in the mailbox.

    http://www.blackstone-labs.com/faq.php
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    Quote Originally Posted by yugrus View Post
    Speaking of fuel dilution, there is a very interesting thread on BITOG that goes about the formula Skyactiv + premium fuel = no fuel dilution. Backed with UOA data too. Interesting. I plan to check that theory with my UOAS over time too.

    That is interesting to me. Why would premium fuel bring no fuel dilution?

    I run premium in my 2.5L SkyActiv engine because it seems to run better climbing grades under load. Maybe it's anecdotal evidence but I do it for peace of mind since climbing grades under load makes engines much more prone to knocking.

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    The engine runs rich on regular to fight detonation at such a high compression ratio, evidenced by the soot build-up at the tail pipe. If you have that, pull a dipstick and smell the oil. It will have strong gas odor.
    Premium fuel does not detonate as readily, so less fueling required to combat detonation. That's how the theory goes.
    This should be the case mostly of the cars that see short trips and stop-n-go. At the high RPM/low load highway driving detonation rarely occurs, so less fueling is required, less soot and oil dilution.
    That soot at the tailpipe further raises the question about what ends up at the intake valves through EGR and PCV. But no engines had been destroyed because of the valve deposits. Yet?

  12. #12
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    Quote Originally Posted by yugrus View Post
    The engine runs rich on regular to fight detonation at such a high compression ratio, evidenced by the soot build-up at the tail pipe. If you have that, pull a dipstick and smell the oil. It will have strong gas odor.
    I have a little soot at the tailpipe of my 2.0L CX-5 but my take on that is it's due to the rich warm-up coupled with the strategy of early exhaust valve opening to heat up the catalyst sooner during cold starts. I don't have a strong gas odor on my dipstick.

    Premium fuel does not detonate as readily, so less fueling required to combat detonation. That's how the theory goes.
    I saw that theory presented on BITOG also. I'm not convinced because the theory assumes the engine management regularly detects detonation and richens the mixture in response. If that were the case, running premium would give a little spunkier performance due to the leaner mixture and more advanced ignition timing but that was not my experience the one full tank of premium I've run. Also, I know timing is dialed back to avoid detonation (typically not in response to detected detonation but to help prevent it from occurring in the first place). Has anyone presented direct evidence that the mixture is simultaneously richened? Because that could be problematic from an emissions standpoint. In addition to the above preventive strategies (to avoid detonation) it has a knock sensor that can signal the engine to take more drastic measures should detonation actually occur. If the detonation sensor was coming into play on a regular basis, then premium really would give stronger performance.

    That soot at the tailpipe further raises the question about what ends up at the intake valves through EGR and PCV. But no engines had been destroyed because of the valve deposits. Yet?
    That's a good point. I think the fact that, after more than 4 years, there have been no problems reported speaks louder to the effectiveness of whatever anti-soot deposit strategies Mazda implemented than any speculation we can muster. Still, it's fun to speculate.

    I bet the catalyst warm-up strategy of rich running coupled with early exhaust valve opening has a cleansing effect on the exhaust valves. Before the valves are hot enough to carbonize, they get a flow of unburnt fuel over them.
    Last edited by MikeM.; 04-01-2016 at 09:08 AM.

  13. #13
    MoMo MikeM.'s Avatar

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    Kedis, thanks for the oil analysis!
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    Arrow SkyActiv Oil Analysis Thread

    Quote Originally Posted by Kedis82ZE8 View Post
    It was overnight from a previous 25 mile drive. I put it up on ramps in garage after this drive, turned off vehicle and changed oil the following morning without starting motor.

    On a side note for those that don't know you can obtain the Blackstone kits free from here:

    http://www.blackstone-labs.com/free-test-kits.php

    You pay for postage to send it in and when they test. I just put postage stamps on the plastic bottle and dropped in the mailbox.

    http://www.blackstone-labs.com/faq.php
    So you change your oil when engine is cold? I thought the common practice is changing the oil when engine is hot so that the oil can drain out faster and more complete? But that's dangerous, so I change the oil when engine is warm.

    I didn't know you can do oil analysis for free. Thanks for the info!

  15. #15
    i-ACTIV AWD Aficionado Kedis82ZE8's Avatar
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    I change it both ways depending on convenience. I really don't see any danger in this... if anything it has given the engine a chance to drain all oil back in to the oil pan. In the middle of winter it might take a little bit longer... this is really thin oil. My Nissans take over an hour for everything to drain back down.

    Oil analysis isn't free... they do send you the sampling container for free though.
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