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Certainly sounds like a cracked cylinder head. If you have coolant all the way up at the exhaust manifold, it's probably coming from the head. Good luck. Mazda has been stepping up and covering these, even those that were out of warranty.

On the other hand, Mazda is moving to a native rear wheel drive platform with a longitudinal inline 6. This is definitely the right direction if you are an enthusiast. I remember Mazda used to be called the "Japanese BMW" by some car magazines. They might actually start making better BMWs...

I was not trying to impugn the rotary engine or Mazda's implementation. I am well aware of the Wankel's quirks. If Mazda every releases something more in line with the FD RX-7 and makes me forget the RX-8, I'll be first in line.

Mazda has some experience with replacing large numbers of engines. If this becomes a truly widespread issue, I would imagine they will set up a remanufacturing shop and start shipping remanufactured engines to people who experience this failure. They did this before with the rotaries in the...

Good luck. NHTSA won't do anything unless they are convinced there is a safety issue. Hopefully enough people complain that Mazda is shamed into formally starting a service campaign, rather than the case by case goodwill that appears to be happening now.

Let's put it this way: if Ford and Mazda were never forced to recall the V6 because of the propensity for a water pump leak to trash the engine, why do you think NHTSA will step up and force a recall for a cracking issue? I just don't see it happening.

What outcome are you hoping to achieve by reporting this to NHTSA? This is not going to be categorized as a safety issue. The engine doesn't fail catastrophically, leaving you in a dangerous situation.

What is likely happening is that the head is developing hairline cracks at the holes where the exhaust manifold bolts/studs go, due to cyclic thermal stresses. That part of the head gets really hot when the engine is running, it is made of aluminum which expands quite a bit with temperature...

Looks like 2020 got the slight bump in torque on premium, so the 2016-2019 all had 310. I thought it was earlier than that. My mistake.

In 2018 and newer vehicles this is true. However, this is incorrect for the 2016 and 2017 models, which made 310 regardless of octane.

The peak torque occurs at about 2k RPM and is not impacted by reduced octane. This theory doesn't bear scrutiny.

It's a bit of a gamble to fix it which is why the dealers typically just jump straight to replacing the engine. It's impossible to know the condition of the crankshaft bearings, connecting rod bearings, and the crankshaft surfaces without really ripping into the engine, which costs big money...

I've read a number of posts about this failure and the stories seem to fall into a couple categories: 1. The check engine light comes on, and the code is related to a timing disagreement between one or both camshaft sensors and the crank sensor. This is likely caused by the oil getting...

The class action suit has been mostly dismissed, I think all but a couple claims have been tossed out. I wouldn't expect any relief to come of this, Ford is choosing to litigate rather than settle. It's a poor design, but the plaintiffs in the case haven't produced evidence that Ford knowingly...

Mazda has been working on this for several years now, you can find patent documents out there from years ago. They describe the Skyactive-X version of this engine along with a hybrid architecture. It would not be surprising if Mazda disassembled a few BMW engines while designing their own I6...

Mazda's website says "three new SUVs by 2023": https://www.mazdausa.com/vehicles/future-crossover-suvs

Yes, I was being somewhat sarcastic in my previous post. Mazda has sold maybe 200k of these engines in the US, and only a fraction of those have accumulated mileage above the 40k+ mile level. To see a stack of failed engines isn't a good sign. I'd expect this to keep happening, the only...

Look on the bright side. There are only about 550 dealers in the US. If each one has a pile of 5 bad engines in the back, that's 2750 blown engines. That's a failure rate of only 2%...

Are they replacing the "short block" or the "long block"? The long block is what they've typically been replacing in these cases - that includes the head.

I'd recommend pulling that injector and checking the resistance. There are several threads on here about injectors. Here's an example: https://mazdas247.com/forum/t/fuel-injector-open-cyl-5.123868383/