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Thread: SkyActiv Oil Analysis Thread

  1. #196
    Registered Member yrwei52's Avatar
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    Arrow SkyActiv Oil Analysis Thread

    Quote Originally Posted by crimeariver View Post
    Quote Originally Posted by crimeariver View Post
    Got an analysis for my 2.5T from oil analyzers... aaaand 5% fuel in 3350 miles.. ouch!

    The oil happened to be a cheap Castrol GTX magnatec. If I understand correctly, it should not affect fuel levels? Better oil should have just maintained the viscosity better.
    Possibly more relevant fact was that I ran only 87 gas this time, as a low interval experiment
    Switching to 91 and AmsoilOE, will check again in 3500.

    At the same time got a report for a q5 with 70+k miles. Only 1.6% over 9500 miles. Most of the mileage was rough due to carbon buildup.

  2. #197
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    That's not good.

    I saw your comments over there that using 87 octane should have no effect on oil dilution. Weren't there other comments here stating that 93 should help with dilution because of how the timing changes in response to it?

    I gotta go out and smell my dipstick tomorrow morning...

  3. #198
    Registered Member yrwei52's Avatar
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    Arrow SkyActiv Oil Analysis Thread

    Quote Originally Posted by Avoidin Deer View Post
    That's not good.

    I saw your comments over there that using 87 octane should have no effect on oil dilution. Weren't there other comments here stating that 93 should help with dilution because of how the timing changes in response to it?

    I gotta go out and smell my dipstick tomorrow morning...
    Based on Mazda's official power curve, the horsepower and torque are exactly the same under 4,000 rpm between 87 and 93 octane. Retarding of timing may happen more frequently on 87-ocatna gas when engine is encountering heavy load, hence there's some advantage here with 93-octane gas. For everyday driving 93-octane gas won't give you any better performance under 4,000 rpm. If you don't use manual shift or Sport Mode on your 6-speed automatic, you can hardly make your engine revving over 4,000 rpm, hence Mazda published both power curves for 87 and 93-octane gas to "prevent unnecessary spending on premium fuel".

    87 or 93, retarding timing alone won't cause any oil dilution issue.

  4. #199
    Registered Member PatrickGSR94's Avatar

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    Just got my first UOA after the last oil change at ~90K miles, with about ~6K on the last fill of Mazda Moly oil. Looks like a pretty excellent report, and they suggest going 8K miles next time!

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    2014 Mazda CX-5 Touring - 88K miles, the family hauler!

  5. #200
    Registered Member yrwei52's Avatar
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    Arrow SkyActiv Oil Analysis Thread

    Quote Originally Posted by PatrickGSR94 View Post
    Just got my first UOA after the last oil change at ~90K miles, with about ~6K on the last fill of Mazda Moly oil. Looks like a pretty excellent report, and they suggest going 8K miles next time!

    One can always tell from a UOA report that if the Molybdenum content is very high at ~650+, it must be from Mazda moly oil.

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