Diagsheet

2021 Mazda CX-5 · symptom sheet

Burns oil or oil level rises

  • 42owner reports
  • 7,500median miles
  • 0involved a crash

Newest report May 11, 2026 · checked Sep 9, 2026

82 of the 143 complaints on this car are about the engine. 42 of those describe oil consumption, which makes it the most reported problem on the 2021 CX-5.

Tick what matches of 42 reports

14
1
5
28
5

What got replaced

Owners who name the part that was replaced mention the turbo (7 reports) and the piston rings (5 reports).

Recalls and investigations

No recall on the engine covers the 2021 model year as of Sep 9, 2026.

When it happens

The middle half of failures fell between 5,500 and 20,000 miles, from the 27 reports that gave a mileage.

121
2122
1423
324
326

What owners wrote

“The low oil light has come on a total of 3 times already for me and I'm only at 18k miles. I have gotten 4 oil changes already. The 2021 models burn oil like crazy and Mazda has not put out an official recall yet. There's a TSB (01-012/21) and a class action lawsuit (8:22-cv-01055 )”

Filed Apr 5, 2023 · 18,000 miles

“The engine low oil light comes on every ~3000 miles when Mazda recommends an oil change at every 7,500 miles. For some reason this engine eats oil and has consistently reproduced the check engine light every 3k miles. Mazda hasn't issued an official recall but has published a technical service bulletin.”

Filed Mar 8, 2023 · 3,000 miles

“New vehicle at approximately 6,000 miles and again at 9,500 turned on low oil light dashboard. Added one quart oil each time (twice) to restore oil level. Vehicle currently has approximately 10,500 miles. McDonald Mazda West slow to respond to performing warranty service related to TSB 01-012/21. Thank you.”

Filed Nov 18, 2022 · 6,000 miles

“New vehicle at approximately 5,500 miles turned on low oil light dashboard. Added one quart oil each time to restore oil level. Vehicle currently has approximately 7,000 miles. McDonald Mazda West slow to respond to performing warranty service related to TSB 01-012/21. Thank you.”

Filed Nov 18, 2022 · 5,500 miles

Should you keep driving it?

This page can't tell you that. 0 of 42 reports involved a crash. Owners who file are the ones who had a bad experience, and nobody checks their reports. If the problem affects steering, braking, power or a fire risk, treat it as a safety fault and have it inspected before a long or high-speed drive.

File your own report with NHTSA. Complaint counts are how a problem gets an investigation.