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In this case you should try to demand a new engine as coolant in the oil definitely can harm the bearings、piston rings、 and many engine internal parts. Dealer’s repair work now really can’t be trusted. There’re too many screw-ups nowadays unfortunately!

Or at least offers something like a Customer Service Program (CSP11) issued for the 2.5T to extend the limited powertrain warranty to 10 years/120K miles for any owners experiencing the coolant leak.

I don’t believe there’s a TSB from Mazda for the cracked head on 2.5L NA with CD yet. The closest one is this Service Alert that covers all the 2.5L NA with CD since 2018 MY. Service Alert No.: SA-037/23 New Cylinder Head Established The Service Alert basically helps the Mazda dealers to...

Some people got confused about cracked cylinder head problem on Mazda’s engines. Mazda has been offering 2 engines on CX-5, a 2.5L NA with cylinder deactivation, and a 2.5T in recently years. Unfortunately both engines suffered cracked cylinder head problem. The 2.5L NA with CD started in...

A new Honda Accord? You’d better do some research on problems from that 1.5L Turbo. Although I have a 1998 Honda CR-V with 195K miles which is very reliable, but newer Honda’s is a different story and I wouldn’t want one.

You can say that to Mazda’s 2.0L / 2.5L NA engines without cylinder deactivation used before 2018 MYs. Since Mazda modified the reliable cylinder head of the 2.5L N.A. for 2018 MY to add cylinder deactivation, I don’t believe the current 2.5L NA engine with CDA is as reliable as the original...

You can say that the cracked head affects mostly the 2.5T but that’s also for 2020 MY and prior before Mazda modified the cylinder head and the exhaust manifold gasket. Mazda has also issued a Customer Service Program (CSP11) to extend the limited powertrain warranty to 10 years/120k mi for...

Thanks for the update. And it’s nice to have the CPO warranty. Honestly I really don’t believe the oil leak from front timing chain cover is the reason to your sudden oil loss. Although the oil seepage from timing chain cover is a known issue and there’s a TSB for it, it’s a very slow...

You should check the back side of the cylinder head by yourself first and see if there’s any sign of oil leaks before you go to the dealer.

Is the steering wheel centered when you drive straight?

I’d check the rear shock upper mount and see if that is broken. Do a search here and It’s a common issue. Unfortunately if that’s the problem, you may have to get entite OEM rear shock which comes with the top mount but the price now is tripled than several years ago. There’re some...

As I’ve been saying many times before, fallen rocker arm on cylinder #4 from the 2.5L NA with cylinder deactivation is the hardware design issue. Mazda used a cheap way to mask the problem by adjusting the oil pressure on adjustable HLAs with a PCM update but the problem could still be...

I wouldn’t trust their word unless they’re willing to put it in writing.

No, a loose oil filler cap has nothing to do with your cracked cylinder head. Even if the cap is indeed loose, it won’t have too much oil coming out if the cap is still on the filler hole. The oil lost that way is minimum which is in no way to make the head to crack! Besides, low oil level...

it’s possible. But we don’t know if those 2.5L NA’s in 2024 CX-5 has all the CD plumbings (hence it has collar control valve) but got disabled by the software, or it’s the previous 2.5L NA used in 2017 or prior CX-5’s. The VIN could have indicated the existence of the CD, but we still don’t...

Yes, it’s my fault that I didn’t tell her our CX-5 doesn’t have parking sensors ⋯ 🤪

Yes the “coolant control valve” with an internal thermostat in question is only used on the 2.5L NA with CD. 2.5T has traditional thermostat housing.

It’s funny that when my wife backed her CX-5 into the neighbor’s wooden fence and broke the tail lens a while ago, she also said she was expecting some warning beeps when the car was getting close to the fence. She’s talking about rear parking sensors on our 2000 BMW 528i, but unfortunately...

Yes, the head has never got updated on the 2.5L NA with CD.

Yes, cylinder head cracking may be happening after Mazda modified the 2.5L NA head for cylinder deactivation which is used in your 2018 CX-5. The cracked area is different from the 2.5T, and an oil leak instead of coolant leak is the symptom. The cylinder head is cracked at exhaust manifold...