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We Well then, delete your posts, drain out 2 quarts (car can run all day long on 3) let that code set, take it to the dealer and get those bad seals replaced with good ones so you don't plug up your cat, or gum up your pistons with all that oil going thru that poor poor engine!! :)

My reply would be there is no overheat issue related to the crack in the head. Says so in black and white in the tsb. Residual mfg fatigue, bumps in the road.....(a hot/vibrating/heavy turbo installed on 6 splinldy little 8mm studs! )

Their going to use the same tactic that Subaru did on their blown head gasket engines a few years ago. Ignore it and it will go away

I hear dropping the engine out on the subframe is the quickest actually. Book times reflect this. 17hrs for a head replacement and 11hrs for an engine change. Leaving it in the car saves zero time

YouTube!! Your channel would get monetized because the video went viral and all the money you make would pay for the fix. ;)

Sorry, but I gotta ask, why did you add oil, and do you know about the TSB?

https://youtu.be/72q69lb3njo?si=cpnQHchV06z--ark At about 4 min when he is scanning the exhaust ports there is a crack on #3 at 12:00. This is out of a 2021 cx-30. If it's a turbo it's got the updated head and it's cracked. If it's the NA CD .... it's head is cracked too. Either way I wanted...

That's has to be frustrating to have only owned the car a short time and the head cracks. Any chance it was cracked when you got it? Probably hard to know. Being a mechanic for 40 years myself, I would be interested to see your findings of the teardown. Are you going to create your own...

Maybe put Non-Turbo also? I think I was confused too. Haha. Putting CD in the title would really mess people up considering 75% don't even know they have it

New mechanic?

Guess it depends on what the cracked trade in allowance would be vs uncracked allowance vs uncracked craigslist/marketplace value. How much will they give you with the head cracked?

Post 302 says this is a NA CD engine I believe. Not a 2.5t. ?

Where was the post on the 22 cracked head?

You can get a 22 for 30 on carvana

Low viscosity to help with mpg? Hmmm, sounds like the lie thats been swallowed hook line and sinker that 0w-20 is a good thing. Good for mpg maybe but not doing your engine any favors

Takes about an hour to replace a LCA on this car. Plus parts plus $150 ish for an alignment

Youtube

The parts dept should have a record that the exhaust gasket was issued to this work order. Its how they get paid from Mazda and also its how they control inventory. This is a big deal. Its a huge repair. Your engine had the updated head and exhaust gasket from the factory which is definitely...

Yup, after the car gets to closed loop I think the upstream keeps switching and the downstream one settles in. And a good way to see cat health is the pipe going in should be about 75 to 100 deg F colder then the pipe going out

Maybe a fuel injector stuck? Could see that on the plug. But you should also show a p0301 if it's #1 cylinder. P0302 #2 etc. Could just be a bad O2 sensor or a bad mass airflow sensor. A good scanner can see if the O2 sensor is switching. Probably worth the money to get it diagnosed