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Same issue with my 2015 GT. All signs pointed to some seepage between the block and timing chain cover. Super slow and not worth fixing. Never has dripped.

@Dobber That's a good question and I think many will deflect with "They want your car to break so you buy a new one"...which makes zero sense. Unless you're a glutton for punishment why would you buy another Mazda? The other reason could be that they can publish lower costs of ownership...and I...

Yeah, the few estimates I could shake out of some mechanics were in the range of $2-3k...one quoted $7k!!! But I think he didn't want the job and argued Subarus are cheaper to do head gaskets on...which I've always heard the exact opposite.

Thanks again for all of the replies. After consulting with a few shops and looking at what you all have said, it sounds like this is more of a wait-and-see situation. One shop said that if it's losing that little coolant then they may find nothing during the diagnostic. And he echoed what...

@sm1ke Wow, interesting to hear. How long have you had this issue of losing coolant?

@edmaz Thanks for the response. I'm assuming a head gasket job is going to be $3k+ with the rates shops are charging and most wouldn't even give me a ballpark which is frustrating. One dealer quoted me about $2500 bare minimum. I'm going to take the advice of everybody and monitor usage. I've...

What's over half a quart? The oil burning? No, it has consistently burned 1/2 qt for the majority of its life. Reservoir is clean. When I did a block test I took the opportunity to examine the coolant I had to remove and no surface sheen. Reservoir has no signs of oil/film residue.

It's always burned about 1/2 qt of oil every 5k miles. This started at maybe 30k and has held constant. I've checked the water pump. I have a bit of the classic "weeping" residue from the weep hole but no crusting or anything. I've yet to FULLY examine the engine block but from the places I can...

In the last 6 months (about 6k miles) I’ve added 24 ounces roughly (4 oz for every 1k miles). It’s obviously leaking somewhere and it’s not external.

@7eregrine Thanks. Yeah, in my short time under the hood of mine doing simple DIY stuff it's amazing how simple they are. Comparatively under the hood of my Tacoma...I don't know which way is up. Just a mess of wires and hoses. Obviously not an apple-to-apples comparison but getting around the...

Well there is a leak. Not sure what you mean. Yeah, most of it is more than likely being burnt but a leak is a leak.

Ok, interesting responses. I'm fairly green when it comes to automotive issues. I do my own oil changes, brakes, etc. But this stuff goes beyond my purview. My assumption is that the gasket can go at any moment, dump the coolant and overheat the engine which is why I'm freaking out a bit. But...

Wait…for real?

I thought I'd also ask if a leak down test is considered the gold standard for confirming a head gasket leak? I just don't want to have the mechanic tear down the engine only to find that I have a cracked head or a pinhole leak in the casting...just something more insidious. I guess they could...

2015 CX5 GT with 100k miles. Long story short I've been chasing a SLOWLY disappearing coolant issue for a few months. Back in September I decided to start changing my own oil and noticed the coolant reservoir was completely empty. Since then I've been monitoring it. A sniffer test proved to be...

My friend swears by the Fumoto valve but I've been trying to convince myself of a reason to use it. Having the valve would make it easy to drain obviously. Both methods involve some type of mess. The valve probably provides a tidier stream of oil? I don't know. I think if I put more miles on my...

Thought I’d chime in since this topic is something I’ve been dealing with lately. I used to do my own oil changes years ago on my cars but stopped once I just got too busy and lost the desire (and the space) to do it. I had been taking our 2015 CX5 to Southtowne Mazda here in Salt Lake for...

@RedBaron Yeah. So bizarre. I told the parts guy that I didn't feel comfortable with that plastic tube in lieu of a metal one. He said the value one is all they use (obviously) and they haven't had problems. Good for them I guess. I'd rather stick with these nicer ones....and for cheaper. He...

So I took that filter back and got the Thailand-made version they have in stock (1WPE14302). Nice actual metal tube with punched out holes. Feel better about using this one and it was 50 cents cheaper.

The Car Care Nut on YouTube had a good video about engine start/stop systems and while he explained how well the systems work and how they won’t destroy your engine, I still feel like the trade offs aren’t worth the potential but what do I know?