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2.5T has variable valve timing on exhaust valves. But after I re-read the sentence of the TSB, I believe you’re right. I remember my previous 1974 Chevy Impala has a “ turnable round valve” in each exhaust manifold which will get stuck all the time due to the red hot heat. The valve is...

The recommended service interval for our FL-22 coolant is: ”Replace at first 192,000 km (120,000 miles) or 10 years; after that, every 96,000 km (60,000 miles) or 5 years.”

Yes. See my previous post.

Based on the first Service Alert, SA-058/20, the PYY4-10-SJ0 is the new cylinder head set which includes cylinder head, (previous head assembly, PYFA-10-100F)、valve cotter、valve SPG-UP seat、valve spring、outer-EX valve spring、inlet valve、exhaust valve. P/N 0000-99-SCX5 then includes PYY4-10-SJ0...

Yes.

Since it affects cylinder compression I’d assume that “valve” is the exhaust valve for the cylinder.

I assume you’d changed your coolant?

Do you have any warranty to cover this repair? If you don’t, this can be expensive. You could argue with the MNAO to cover some repair cost as your 2019 CX-5 has only 26K miles. It’s a design flaw by Mazda hence they modified the exhaust manifold to prevent this problem happening. Keep...

A simple solution to your scenario: wait the oil to drain back to the oil pan fully with enough time, preferably overnight, then you’ll get a consistent oil level reading on the dipstick. “If you’ve never owned an engine that didn’t nail the full mark after adding the nominal oil fill volume”...

Your statement makes me wonder why we have such different experience on oil change. I had a couple of Chevy’s back then, and I poured in the said oil amount, and the oil level would always be at the Top / Full mark of the dipstick. As I mentioned earlier, even today, I put in the said oil...

Based on reports from those who had the cracked cylinder head with oil leaks, no, no CEL or Low Oil Pressure warning light from dash. Most of them have oil burning smell, as the leaked oil will drip to the hot exhaust manifold.

Your experience definitely is different from mine. For all vehicles I’ve touched, VW、BMW、Honda、Nissan、Toyota、GM、Ford、AMC、you name it, changing the oil for the last 50 years, if I use specified oil quantity in the manual, it all ends up at the Full mark of the dipstick! My Mazda CX-5 is the...

Sorry, my mistake. And the oil leaked from cracked head usually is only on engine underneath cover, not on front bumper. Your brother’s case is a weird one and needs further investigation. Keep us posted.

Yeh the oil level dipstick design on CX-5 isn’t the best. But since I always measure the oil level the first thing in the morning before the engine starts like the old days, the oil residue on the dipstick is a lot easier to see, and I don’t even need to wipe the dipstick、insert and pull it to...

It’ll continue to extend the coverage to the newer MY’s as the time goes on, as Mazda has decided NOT to update the cylinder head for the 2.5L NA with cylinder deactivation since 2018 MY for various reasons. The cylinder head is still the same since 2018, the possibility of cracking will always...

Yes it is based on your video. The oil leak from cracked head is from the back side of the cylinder head usually between cylinder #2 and #3. Just show the video to the Mazda dealer, and ask them to replace the head based on the Service Alert.

But the aftermarket air / cabin filters at Amazon are also more expensive than a couple of years ago!