Hello. I have a new 2023 CX5 signature turbo. Love it. Runs awesome. No problems. I changed the oil at 1100. Then at 5k. And around 3500-4300 miles since. I just changed the oil at 4300 today. It was pretty dirty. I have been using the Mazda filter for the Turbo, (1WPY-14-302, didn't want to use the value filter). I have been using Pennzoil Ultra Platinum, (this oil has allot of detergents). Also car has only 15k. Checked the air filter and it was not that dirty at all.
So I have a theory. The oil with it's detergents are actually cleaning the combustion chamber very efficiently. You know, being direct injection and all. Maybe this is a good thing. Maybe it's actually cleaning the combustion chamber and turbo really well. Does anybody agree with this theory?
Thanks for any response.

 

Well I would hope you don't have oil in your combustion chamber ! It is around the combustion chamber, but not in it. If it was, your car would be smoking like crazy....

 

It’s normal for the first even second oil change for it to look less then stellar. The engine has many assembly lines and other metal protection chemical . None harm the engine and ALL can be seen if you invested in a oil analysis.

wait until you see the color of your Mazda ATF at your first oil and filter change which I hope you do at no more then 15k miles. Sooner is all around healthier for your transmission.

The service schedule states lifetime no service…it’s your investment so u can decide for yourself . Or look around the last few threads I responded on in the last couple days on sooner is better and why along with empirical oil analysis information.

 

Welcome to the forum

 

I read several dozen oil analysis on both Turbo and normally aspirated DI (direct injected) engines Mazda from production years 2012-2022 and there was no indication that this was evidential . But it was a nice DIY theory.
If it were only that easy? About the best most can do even DIY is during the cleaning of the throttle body and the 3 main sensors in the intake system is to wipe the inside of the intake manifold. There will always be a slight amount of oil film in a DI engine on the walls of the intake but it is very inconsequential and cant really even be measured. Sparkplug are also an indicator of oil being travel through the intake manifold and for the most part on engine with less then 200k miles it barely shows so little that it would be hard to claim a %.
The Mazda Skyactiv engine full break in at or about 10-15k miles. Not the old-school at less then 100 miles.

 

Having your oil analyzed can confirm what I previously post.

Blackstone Laboratories Oil Filter Inspection - Mazda Forum - Mazda Enthusiast Forums

 

Correct me if I'm mistaken. I Believe all ICE burn oil. Oil must pass piston rings, valve guides and seals. Ideally though, at a microscopic level, (maybe a tablespoon or 2 per oil change). I think it would be detrimental to your engine if no oil passed through rings and valve guides and seals. So if oil does pass through, isn't it possible for carbon to some degree pass into the block. How else would oil get dirt at all. Differential oil gets dirty from bearing wear, environment, etc. But it's a different type of dirty. Grey metal type coloring. Engine oil definitely has a carbon dirt type color. There must be some passing through.

 

Yup. Definitely some ATF change. I have 15k now. Weather is cold and snowing. It will probably get done around 17 k.

 

when you drop your pan I suspect you will be a supporter of servicing. While you are there wipe the valve body and you can use Wd40 . Remember it is a solvent and will not harm the transmission in the small amount of residue that remains after using it to clean .

I would also recommend to replace the stock ring magnet with a Neodymium ring magnet.

Do not use sealer use a pan gaskit .

 

The oil you mention does lubricate the part you mention but your volume passed on to the combustion chamber is all wrong if the parts mention are not damaged or worn out. And if that amount was contaminating the oil sump it would show in higher emission and much darker color oil. As for carbon well here again if the parts are not worn the small amount of oil that actually gets into the combustion chamber is less likely to build and significantly notice or concerning amount of carbon. Naturally for the purpose of this forum I am stating fats on Mazda currently built Skyactiv engines. Although this has been a pretty standard fact for most production engine (I said most) since about 2000.

Now my cumbustion chamber and pistons are virtually pretty much carbon free. But then I clean the intake valve stem and back, combustion chamber and tops of piston at least once a month when we travel 2 hours one way on the highway at average 70mph to visit my son and grandkids

Oh and I clean my spark plugs about the same or when I just feel I should, engine idling and at operating temperature and I manually activate my N2o for about 5 seconds . Clean them up so well they look new out of the box .

Getting back to your observation of your oil in your option looking dark I would get it analyzed and see exactly what you’re seeing.It just could be something as simple and common as heat.