SkyActiv Oil Analysis Thread

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CX5 GT
The test was done long time ago. I can only guess they either bumped up a bit the moly or there is slight variation in batches.
On my past 4x different tests Moly is from 590 to 700 :) Notice that I dont even drive that much between oil changes. Go figure.

Nevertheless the oils with so much Moly (600+) that I know are the Mazda oem and Toyota oem 0w20.
 

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Southwest Ohio
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'19 CX-5 diesel
My latest 2.2 diesel uoa. 22.5k mile service. Viscosity low again, 2% fuel, no oil level increase though.

Next service (30k mi) is the last of the free 2yr / 30k service. I'll be changing oil at 5k mi and see how the viscosity looks after the next service.
 

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yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
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Plano, Texas, USA
My latest 2.2 diesel uoa. 22.5k mile service. Viscosity low again, 2% fuel, no oil level increase though.

Next service (30k mi) is the last of the free 2yr / 30k service. I'll be changing oil at 5k mi and see how the viscosity looks after the next service.
Looks like this Idemitsu made Mazda SkyActiv-D SAE 0W-30 Diesel Engine Oil is consistently having 400 ~ 430 molybdenum whereas Mazds moly 0W-20 oil is 600 ~ 700. I assume you eventually will buy Mazda diesel 0W-30 oil for your 2.2L diesel when Mazda’s free oil change runs out, I was curious about the price of the oil. If the approximate oil quantity in owner’s manual for oil change is correct, you need at least 5.4 quarts for each oil change. And:

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Southwest Ohio
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'19 CX-5 diesel
@yrwei52 yep ... I've already bought a case of Mazda Oil (it was somewhere in the $6-$7/QT range) and a case of Mobil ESP 0w30 that was slightly higher.
 
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CX5 GT
You had some silver in the oil? I wonder what part of the diesel engine is made out of silver.

Bearings usually have a coating layer. The diesel components are usually quite different than the petrol ones.

I still think based on the uoas so far that this engine needs more frequent oil changes. 5000 miles or less.
It needs more than 2% for diesel in oil so that it shows on the dipstick.
 
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Southwest Ohio
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'19 CX-5 diesel
I still think based on the uoas so far that this engine needs more frequent oil changes. 5000 miles or less.

The TBN is good @ 7.5k but I don't like that the viscosity is low. I agree this will be better off with 5k mile intervals.
 

CarpeDiem

Under Pressure
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Superstitions
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2021 Carbon T
You had some silver in the oil? I wonder what part of the diesel engine is made out of silver.
Odd as it sounds, silver is used in some high-performance engine bearings. I don’t know if Mazda does this or not, but that would be once source of metallic silver. Subaru owners see the same thing.


 
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16.5 CX-5 Tour/AWD
I did my oil analysis at 73K and apparently there's a coolant leak. I brought my vehicle to a mechanic 2 months ago and he did a pressure test but did not find any sources of a leak so I am not sure. I did put some UV dye in the coolant reservoir to see if the funny smell coming from my heater was due to a heater core leak but there wasn't anything noticeable.
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CX5 GT
There was another report few months back for coolant in the oil and a separate forum thread but no replies after February on the subject.
The general advice was to first do 2nd test at a different lab. Small quantity of oil sample can be taken out through the dipstick tube. i.e from the new oil at present without the need to change it again.
 
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16.5 CX-5 Tour/AWD
There was another report few months back for coolant in the oil and a separate forum thread but no replies after February on the subject.
The general advice was to first do 2nd test at different lab. Small quantity of oil sample can be taken out through the dipstick tube. i.e from the new oil at present without the need to change or take it out.

Thanks for sharing! I'll probably do an analysis from Blackstone labs this time to confirm if it's indeed a coolant leak. Hopefully my car isn't toast lol
 
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2017 CX5 AWD Touring
I did my oil analysis at 73K and apparently there's a coolant leak. I brought my vehicle to a mechanic 2 months ago and he did a pressure test but did not find any sources of a leak so I am not sure. I did put some UV dye in the coolant reservoir to see if the funny smell coming from my heater was due to a heater core leak but there wasn't anything noticeable.

So a blown head gasket?

Have you ever over heated it?
 
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16.5 CX-5 Tour/AWD
So a blown head gasket?

Have you ever over heated it?

Never overheated anything but the coolant leak I'm referring to is from the oil analysis. I'm planning to submit another sample to Blackstone labs to confirm before taking any action in addition to performing a visual inspection.

Others have suggested to perform a pressure test as well which I may attempt.
 
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2014 CX-5 Touring
Coolant in the oil would indicate a head gasket breach. How's the oil looking on the dipstick, milky light brown at all? How's the coolant look in the radiator and overflow bottle? Any signs of oil slick in the liquid?