SkyActiv Oil Analysis Thread

This report from January 2024 shows four samples on the CX-3. Went with Castrol, Pennzoil, Mobil 1, Valvoline
Which oil was sampled on 08/04/2019? It has too much calcium and not enough magnesium for these engines.

And your most recent oil sampled on 01/17/2024 looks like 5W-30 based on the viscosity. No way that was 0W-20 after 9,000 miles.
 
Which oil was sampled on 08/04/2019? It has too much calcium and not enough magnesium for these engines.

And your most recent oil sampled on 01/17/2024 looks like 5W-30 based on the viscosity. No way that was 0W-20 after 9,000 miles.
You are correct. I noticed that the top of the report says that most recent sample was from 5w30. Let me check my order history for the August 2019 sample. I usually order oil a few weeks ahead of time. On 3/6/2019 I ordered Zepro Eco Medalist 0w20... It was Zepro (https://www.amazon.com (commissions earned))! In an email to the lab contact I stated so to make sense of the higher moly figure.
 
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You are correct. I noticed that the top of the report says that most recent sample was from 5w30. Let me check my order history for the August 2019 sample. I usually order oil a few weeks ahead of time. On 3/6/2019 I ordered Zepro Eco Medalist 0w20... It was Zepro (https://www.amazon.com (commissions earned))! In an email to the lab contact I stated so to make sense of the higher moly figure.
That Idemitsu was the closest you could get to the Mazda OEM high-moly oil (also made by Idemitsu)
 
Note that most modern oils are already using advanced forms of moly that are 2-3x more effective per part than standard moly, and even better if they are also using boron, which is another friction modifier that works from colder temperatures. These modern oils are formulated such that everything is balanced, because some additives have effects on others in the bottle.
 
well she at least doesn't look like she is going to blow lol....I am happy that the fuel is low..I did a long 2500+ mile road trip running hard ie over 80 mph much of the way and over mountain passes running the rpms pretty high...on this oil change.

Screenshot 2025-08-22 at 4.35.02 PM.webp
 
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