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- Plano, Texas, USA
You said your 2021 2.5T “add about 10-12 ounces of oil to bring the level back to the upper dot on the dipstick after 2,500 miles”, this means your 2.5T burns ¾ quart of oil per 5,000 miles. While it isn’t excessive to car manufactures but it is to most enthusiastic car owners especially for a new engine. My 2.5L NA burns ½ quart per 5,000 miles and I’m not really happy about it but at least I don’t have to add any oil between oil changes. For comparison, my 1998 Honda CR-V didn’t use any oil when new, and uses about ½ quart of oil in 5,000 miles right now at 191,776 miles.⋯ Checking/adding a little oil is not a big deal for me as I have a nice garage full of tools and I've been working on my own cars for 50 years. So long as the oil consumption does not significantly increase I have no problem leaving things as they are.
Burning oil isn’t good to your expensive catalytic converter and oxygen sensors in the long run. If you don’t plan to keep your CX-5 long then you may not to worry about burning some oil at your rate. I personally would take all my effort to get those defective exhaust valve stem seals replaced under warranty if I had a 2021 2.5T. Just like I pushed my Mazda dealer to replace the defective rear disk calipers under warranty once I saw the related TSB posted here.