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Re: Milesyn SXR, 0w20, 5,100mi, 2018 Mazda3 2.5L [Re: RayCJ] #5113367 05/23/19 10:00 AM
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badtlc Offline
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Originally Posted by RayCJ


Do you happen to have any reference materials that describes the Skyactive ECU / timing theory? I know the vehicle has several fuel and spark pulses per cycle but, the info was just from a lecture series hosted by the Mazda product manager. It was very high level and I'd like to know more about the engine.



Feel free to google. I researched all this when I bought my 2012 Mazda3 skyactiv. You can find plenty of data from mazda about running rich to allow 87 octane. You'll need to do more digging to understand the A:F ECU trimming. I believe this technology was rolled out industry wide when Flex Fuel vehicles rolled out as they can actively change engine tuning (not just timing) based on running regular unleaded vs E85. Most of the links I have from this time period of research no longer work.

There are UOAs on this site proving the fuel dilution goes away when you run premium. The proof is in the pudding, so to speak.


2007 Ford Escape XLS 2.3L ATX, M1 AFE 0W20, Fram TG, 167k
2015 Chrysler T&C, 95k+, M1 5W30, Wix OF
2018 Forester Premium 10k+, M1 5W30, EcoGard Syn OF, ST 75W90
Re: Milesyn SXR, 0w20, 5,100mi, 2018 Mazda3 2.5L [Re: RayCJ] #5116449 05/26/19 02:22 PM
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I don’t think it’s just the Skyactiv engines that Mazda richens excessively- my 2011 Fusion was very predictable- let’s call say 80*F the baseline where best mileage was achieved. In fall/winter, it was extremely predictable- with no changes in driving route or throttle application, every 10*F drop in ambient would shave 1mpg from the hand-calculated average. In hot summer, I would routinely knock down 36.8-38mpg on my work route.

Take that down to say 10*F in December, and I would see mileage fall to 29-30mpg, and no excessive idling either- wait 30 seconds for oil to circulate and then proceed on the 7-minute drive out of town before hitting the highway. However, there were no statistically significant changes to viscosity, TBN, or wear metals during cold weather.

Re: Milesyn SXR, 0w20, 5,100mi, 2018 Mazda3 2.5L [Re: RayCJ] #5119129 05/29/19 10:02 AM
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Matagonka Offline
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I have the same exact car. Glad to see a good report on these engine.


2018 Mazda 3 Touring HB 2.5
Re: Milesyn SXR, 0w20, 5,100mi, 2018 Mazda3 2.5L [Re: Matagonka] #5119437 05/29/19 03:24 PM
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RayCJ Offline OP
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Originally Posted by Matagonka
I have the same exact car. Glad to see a good report on these engine.


I hope you enjoy your Mazda3 as much as I enjoy mine. Really nice car so far!

FYI: In all my other vehicles, I typically go from 87 to 89 octane in the hottest months of the year. This is just a (old-school thinking) preventative measure but, it does help in my wife's 2007 Madza6 (confirmed observation).

My tank is 13.2 gallons. Last week I filled-up with 10.7 gallons of 89 octane because our temps were hitting in the mid/high 80's and last couple days, we've had low 90's. I now have 150 milles on that tank and the trip computer is not showing any noticeable change in fuel economy. The engine does seem slightly more responsive but, I doubt it's from the difference in fuel. It's probably related to the overall higher temperatures. This vehicle loves warmer temperatures.

I will continue using 89 octane until the next oil change and will note observations as time passes. We shall see if there are any significant differences in fuel dilution or viscosity and of course, fuel mileage will be logged. In the following year, I'll just use 87 all year.

Ray

Last edited by RayCJ; 05/29/19 03:24 PM.
Re: Milesyn SXR, 0w20, 5,100mi, 2018 Mazda3 2.5L [Re: RayCJ] #5120111 05/30/19 09:00 AM
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I know back in the day the Mazda's shared platforms with Ford. Is this 2.5 Mazda one that is a shared design to the Ford 2.5?


2018 F150 5.0
2016 Ford Fusion 2.5
Re: Milesyn SXR, 0w20, 5,100mi, 2018 Mazda3 2.5L [Re: 1978elcamino] #5120130 05/30/19 09:17 AM
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Originally Posted by 1978elcamino
I know back in the day the Mazda's shared platforms with Ford. Is this 2.5 Mazda one that is a shared design to the Ford 2.5?



Nope it’s all new. Only the displacement size remained the same.


2017 Mazda CX5
Havoline Pro DS 0w20
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Re: Milesyn SXR, 0w20, 5,100mi, 2018 Mazda3 2.5L [Re: PimTac] #5120500 05/30/19 04:16 PM
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Originally Posted by PimTac
Originally Posted by 1978elcamino
I know back in the day the Mazda's shared platforms with Ford. Is this 2.5 Mazda one that is a shared design to the Ford 2.5?


Nope it’s all new. Only the displacement size remained the same.


Pretty sure the "Skyactive" line came out in 2010/11 timeframe and that's when Ford and Mazda went separate ways. I had a 2009 Mazda6 that had a 2.5L engine and it was identical to the Ford Fusion engine.

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