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Idemitsu Zepro Dex1 0w20, 5500 miles, 2015 Mazda3 #5456099 06/17/20 01:45 PM
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littlehulkster Offline OP
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First UOA on the Mazda. I don't know if I should be worried about this copper, or just keep an eye out as Blackstone recommends. Everything else looks ok though.

[Linked Image]

Last edited by littlehulkster; 06/17/20 01:45 PM.

2015 Mazda3 I 2.0
Re: Idemitsu Zepro Dex1 0w20, 5500 miles, 2015 Mazda3 [Re: littlehulkster] #5456164 06/17/20 03:03 PM
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PimTac Offline
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I’m not sure why they even brought up the copper numbers. Nothing wrong there.

Report looks great.


2017 Mazda CX5
Mobil 1 Annual Protection 0w20
Roki OEM filter.
Re: Idemitsu Zepro Dex1 0w20, 5500 miles, 2015 Mazda3 [Re: littlehulkster] #5456205 06/17/20 04:01 PM
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haggler Offline
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Looking like a decent amount of fuel dilution, probably higher than what Blackstone says. Your viscosity is towards the low end of w20 and flashpoint low. What is your percentage of city vs highway driving? Do you short trip a lot? This is precisley why I'd rather use a w30. I ran my miata hard for a good hour drive, came home and wanted to check the oil. I waited about 15 minutes for things to cool and when I pulled the dipstick all I smelled was gas.


2019 MX-5 Soft Top Miata - Soul Red Crystal - M1 EP 0w20 - M1 EP 108a Filter
2020 Chevrolet Equinox - Factory Fill/Filter
Re: Idemitsu Zepro Dex1 0w20, 5500 miles, 2015 Mazda3 [Re: haggler] #5456344 06/17/20 06:27 PM
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littlehulkster Offline OP
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Originally Posted by haggler
Looking like a decent amount of fuel dilution, probably higher than what Blackstone says. Your viscosity is towards the low end of w20 and flashpoint low. What is your percentage of city vs highway driving? Do you short trip a lot? This is precisley why I'd rather use a w30. I ran my miata hard for a good hour drive, came home and wanted to check the oil. I waited about 15 minutes for things to cool and when I pulled the dipstick all I smelled was gas.


I do mostly short trips and I live in a really cold area. The flashpoint is below where it should be, but the viscosity still looks ok (especially given as this is a VERY light oil) so I'm not super worried.


2015 Mazda3 I 2.0
Re: Idemitsu Zepro Dex1 0w20, 5500 miles, 2015 Mazda3 [Re: littlehulkster] #5456582 06/18/20 06:38 AM
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JustN89 Offline
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There's nothing to see here, imo. 3 ppm above "average" is next to nothing. The viscosity did shear down a bit, but at this point I don't see any reason indicating that you have to make changes. I do agree that you have some fuel dilution happening. If it were my car in that climate and I were outside of warranty, I'd pick a good 0W-30 and go with that. However, I don't think you need to do anything different here. I'd run another 5k-ish mile OCI and resample if you want verification that the copper truly was nothing or confirmation that your engine is continuing to dilute the oil.


You know what they say, cross threads are tighter than locktite!
Re: Idemitsu Zepro Dex1 0w20, 5500 miles, 2015 Mazda3 [Re: littlehulkster] #5456886 06/18/20 11:47 AM
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buster Offline
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Looks good. Skyactiv engines show low wear most of the time. Quite similar to Toyota.


2020 - Mazda CX-30 - Mobil 1 EP 0w20
2019 - Subaru Impreza - Dealer Oil
Re: Idemitsu Zepro Dex1 0w20, 5500 miles, 2015 Mazda3 [Re: JustN89] #5456955 06/18/20 01:01 PM
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littlehulkster Offline OP
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Originally Posted by JustN89
There's nothing to see here, imo. 3 ppm above "average" is next to nothing. The viscosity did shear down a bit, but at this point I don't see any reason indicating that you have to make changes. I do agree that you have some fuel dilution happening. If it were my car in that climate and I were outside of warranty, I'd pick a good 0W-30 and go with that. However, I don't think you need to do anything different here. I'd run another 5k-ish mile OCI and resample if you want verification that the copper truly was nothing or confirmation that your engine is continuing to dilute the oil.


I might try that next. I will resample this too to see if the copper is just an anomaly, because everything else looks pretty good.

The fuel is there, but keep in mind too that this is a VERY thin oil. Virgin KV @100 is only 7.9. So the fact that it didn't shear out of the acceptable range for a 0w20 is actually pretty remarkable.


2015 Mazda3 I 2.0
Re: Idemitsu Zepro Dex1 0w20, 5500 miles, 2015 Mazda3 [Re: littlehulkster] #5457001 06/18/20 02:11 PM
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littlehulkster Offline OP
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Forgot to mention, as well, that this was a Wix 57002 filter. Some people seem to think they're not good, but I think these results show they work fine.

Replaced with a OEM Thai Mazda filter (probably Denso made) because it was actually cheaper than the Wix this time around.


2015 Mazda3 I 2.0
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