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I did the 3 drain/fill method with a pan drop and filter change on the 3rd drain, at around 112K miles. Wish I had done it sooner, but it definitely wasn't a bad thing to do it when I did. I waited about a week or two between each drain and fill. Used 12 or 13-ish quarts of FZ, new OEM...

no need to swap it at a certain odometer reading. Just keep a watch on it, and replace it if it starts leaking fluid. That's what I did.

Ah ha you were on my Reddit digest email this morning. 😎

Well for one thing a regular commercially available synthetic oil like Mobil1 would be considerably cheaper than OEM, and easier to get. Also we just did our vacation trip and I saw ZERO evidence of coolant loss. I’ll change the oil again soon and get it analyzed to see what it shows.

$40 vs. $150+. I think there may be a similar thread dedicated to the tensioner also. I installed this one in early 2021. https://www.rockauto.com/en/moreinfo.php?pk=11190373&cc=3312788&pt=11659&jsn=828...

wow it's the actual Mazda branded part. Many of us have opted for the identical INA-labeled part from RockAuto which goes for much less $. Identical in every visible aspect aside from the Mazda logo.

back from the trip on Saturday, zero issues whatsoever. No loss of coolant at all that I can see. Oil level is down just a bit, currently 1/2 quart low after 2,500 miles since last oil change. But in my mind, using 1 quart in 5K miles isn't that bad. Plan to drain oil within the next ~500...

Made it to FL yesterday with zero issues. Coolant temp on my phone stayed rock solid 187-189 in the morning and 190-192 in the afternoon. Checked today and saw no visible coolant loss. Oil still looks good also. And managed to drop the rad cap down the engine bay, and luckily I was able to...

Yeah possibly. I’m just wondering if I should switch to a different oil or different viscosity other than the OEM Mazda Moly 0w20 oil I’ve been using the past 6 years.

I'm still trying to decide what to do. Everything I've learned and heard over nearly 25 years of working on my own vehicles, tells me to never use any sort of "stop leak" product, but in this case it might be warranted. I think I would bypass the heater core, and also go ahead and replace the...

alrighty so I did the combustion gas coolant test and compression test. All showed perfectly normal. Zero combustion gasses present in the coolant, and compression showing 155-155-150-155 so that's perfect. But as I suspect, if it's only coolant getting into the oil itself, the combustion...

is that Top Tier though?

your experiences seem pretty similar to mine so far. I'm wondering if it would be worth it to bypass the heater core (probably don't need it much here in summer lol) just temporarily, while using the Bar's product. Might save the heater core from getting stopped up and reducing efficiency...

Thanks, I'll read through your thread also. So over the weekend I did a few more visual checks. Although the coolant level in the overflow bottle was slightly low, right at the Low line, it was still within the low/full range. I've only added coolant to the bottle once since last July. This...

wow awesome, thanks. I looked all over for 2.5L Skyactiv videos and couldn't find much. Gonna be quite a different animal with the engine in the car, though.

Yeah I have OBD Fusion for my Miata that doesn’t have a functional coolant temp gauge. Since it’s also Mazda I might see if the Bluetooth OBD2 dongle I have in that car will work in this one, since I already have Mazda vehicles downloaded for it.

Last July’s oil report showed a trace of coolant and increase in potassium. This report showed even more coolant and higher potassium. I had planned on doing a shorter interval and checking with a different lab, but never got around to it. Fixing it is really our only option. We can’t afford...

Well this is not what I wanted to see. 137K miles on our CX5 Touring that we've owned since 2016 with about 54k miles. Last oil analysis report last July showed a trace of coolant present in the oil, and this oil change end of last month showed more coolant. I have noticed a *very small* loss...

Well that's not what I wanted to see. I'm hoping for a possibility of something other than the head gasket, but am also preparing to do the work (looking at procedures, parts prices and availability etc). Super bummed about this, and we're about to drive the car on our family vacation trip in...