2017~2021 Any issues with 2.5 turbo coolant leaks and engine replacement?

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CX5 GT
Probably it's too early to tell for the CX-5. The 2.5T is too new on CX-5s and not that many vs every CX-9 gen2 is 2.5T if I am not mistaken.
 
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Mazda Protege DX
I had my engine replaced at 24000km LOL, 1 cylinder has much lower compression. Apparently I'm not the only one.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
Anyone having issues with the 2.5 turbo engine leaking coolant and the engine needing to be replaced like some are having with the CX-9? See this thread in the CX-9 forum for details on that: https://www.mazdas247.com/forum/ind...acement-what-can-be-done-to-prevent.123875515
So in that unscientific poll 21.7% CX-9 owners were having coolant leak problem and got their 2.5T engine replaced. So assuming all SkyActiv-G 2.5T’s are created equal, we should see 21.7% of the CX-5’s with 2.5T are having the same issue. But in reality, we’ve only seen reports here on 2.5T CX-5 with low compression issue on certain cylinders causing the engine replacement.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
it is, but the cx9 numbers sold are nowehere near what cx5 sold numbers are.
But most CX-5’s sold in North America are not equipped with the 2.5T, and all CX-9’s are come with the 2.5T.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
We’ve seen a couple of UOA reports from their CX-5 which indicate severe coolant leak with high levels of potassium and sodium. But those are all 2.5L. I guess not many CX-5 owners with the 2.5T are willing to DIY on oil change, and send sample for a UOA. Or we may see more of this complaint on the 2.5T CX-5.

Still waiting for some 2.5T owners who is interested in doing ATF drain-and-fill ⋯ :p

SkyActiv Oil Analysis Thread

Glad to see so many great Blackstone reports for the 2.5 SkyActive! Mine was also, until now......

Link to Discussion thread:
https://www.mazdas247.com/forum/index.php?threads/2015-cx-5-2-5-skyactive-coolant-in-oil.123874610/


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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.
View attachment 297881
 
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CX5 GT
You outlined it pretty accurate. Not many DIY and even fewer that post in the forums. Most I guess go to the dealers and don't bother, the rest are interested primarily in accessories and infotainment features, etc.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
You outlined it pretty accurate. Not many DIY and even fewer that post in the forums. Most I guess go to the dealers and don't bother, the rest are interested primarily in accessories and infotainment features, etc.
Based on the coolant leak report on 2.5T from CX-9, they claimed the dealer saw the coolant from the rear side of the engine. Which to me most likely is external cracks developed on cylinder block, or less likely the cylinder head. The head gasket or cylinder head coolant leak normally can only be detected from UOA or the oil stain in radiator and coolant reservoir. You can’t see the coolant from outside. Of course when the coolant level is dropping, it could be the sign of coolant leak. But it can be from leaking water pump and there’s a TSB for it. Many, including me, have found the coolant level will drop gradually over time with no reason can be found.