Mazda Spark Plugs
Spark plugs are the widest spread in the Mazda schedule and the easiest figure to get wrong: from 40,000 miles to 120,000 depending on the model, and on four models depending on which of two engines is fitted. Mazda also gives no month or year limit for any of them — every plug sentence in this family is mileage only.
What the Plug Change Covers
The right plug for your engine, which is not always the right plug for your badge.
The heat range Mazda specifies
Aluminium heads are unforgiving
Checked while the plugs are out
Four Figures Across Twelve Models
Every one of these is a printed Mazda sentence. None of them carries a time limit.
Sourced from the Scheduled Maintenance section of each model’s 2026 Mazda owner’s manual. Your own manual is the authority for your vehicle; bring the mileage and our team will read the table with you.
Which Plug Your Engine Takes
Mazda names these by part number, and sibling models genuinely differ.
The 2.5 and the 2.5T Take Different Plugs
Mazda specifies a PE5R part for the SKYACTIV®-G 2.5 and a PY8V-18-110 for the SKYACTIV®-G 2.5T. Same badge on the tailgate, different plug and a different interval.
The Inline-Six Is Its Own Part
The CX-70 and CX-90 take Mazda Genuine H302-18-110, six plugs, at 40,000 miles. The plug-in hybrid versions of the same two vehicles take a different part on a 75,000-mile interval, which is the sharpest difference between those siblings.
No Time-Based Figure Anywhere
Not on any of the twelve models. Every plug sentence Mazda prints in this family gives a distance only, so a "replace every five years" answer would not be Mazda’s.
Does Severe Driving Shorten Them?
On the MX-5 pair Mazda prints the same 75,000-mile figure in Schedule 1 and Schedule 2, and on eight of the twelve models it states that only the oil changes. So the plug interval does not move.
Eight Models: No Weather Condition at All
On the Mazda3 Sedan, Mazda3 Hatchback, CX-30, CX-50, CX-70, CX-70 Plug-In Hybrid, CX-90 and CX-90 Plug-In Hybrid, Mazda lists three severe-driving conditions: extended idling or low-speed operation, driving mainly on unpaved or dusty roads, and driving mainly on mountain or uphill roads. Heat, humidity and rain are not on the list. If none of those describes how you drive, Mazda’s normal schedule is the one for your car.
CX-50 Hybrid: A Fourth Condition, for Load
The CX-50 Hybrid carries the same three conditions plus one more, and it is about load rather than weather: a heavily loaded vehicle — towing a trailer, using a camper, using a car-top carrier. Mazda maps that fourth condition to the transmission fluid and both differential oils, inspected at 20,000 miles and replaced at 40,000 miles, and not to the oil.
CX-5: Humidity Counts, Item by Item
The CX-5 is the one model where Mazda maps each severe condition to specific items rather than to the whole car. Extremely humid climates and extensive brake use move the brake fluid to annual replacement; short trips, extreme heat and heavy rain move the drive belt inspection to every oil change. Mazda triggers the 5,000-mile oil interval only from prolonged idling, unpaved or dusty roads and sustained mountain driving.
MX-5 Miata and MX-5 Miata RF: Schedule 2
These two work differently again. Mazda lists nine severe conditions and any one of them moves the car to Schedule 2 in full — and extremely hot conditions, extremely humid climates and repeated short-distance driving are all on that list. Schedule 2 brings 5,000-mile tire rotations, 5,000-mile brake inspections and 30,000-mile manual transmission oil. The oil itself stays on the flexible wrench-indicator interval unless the car is idled heavily or driven in dust.
Mazda Spark Plugs Near Mobile, AL
Dean McCrary Mazda replaces Mazda spark plugs with genuine Mazda parts at our service department on the I-65 Service Road in Mobile.
Four Intervals, and Which One Depends on the Engine
40,000 miles on the CX-70, CX-90 and the SKYACTIV®-G 2.5T versions of four models; 70,000 on the CX-5; 75,000 on the MX-5 Miata and MX-5 Miata RF, both plug-in hybrids and the SKYACTIV®-G 2.5 versions of those same four models; 120,000 on the CX-50 Hybrid.
There Is No Time Limit
Mazda gives no month or year figure for spark plugs on any model in this lineup. A page offering you a time-based Mazda plug interval is offering you something Mazda does not publish.
Mazda Spark Plugs Questions
How often should Mazda spark plugs be replaced?⌄
Between 40,000 and 120,000 miles depending on the model and the engine: 40,000 on the CX-70, CX-90 and the SKYACTIV®-G 2.5T versions of the Mazda3 pair, CX-30 and CX-50; 70,000 on the CX-5; 75,000 on the MX-5 pair, both plug-in hybrids and the SKYACTIV®-G 2.5 versions of those four models; 120,000 on the CX-50 Hybrid.
Is there a time limit as well as a mileage?⌄
No. Mazda states no time-based spark plug interval for any model in this lineup — every plug sentence is mileage only.
My CX-50 and my neighbour’s CX-50 have different figures. Why?⌄
Because they probably have different engines. The SKYACTIV®-G 2.5T is on 40,000 miles and the SKYACTIV®-G 2.5 on 75,000. Four models in this lineup are sold with two engines, and it is the most common source of a wrong answer.
How much is a Mazda spark plug replacement?⌄
A four-cylinder and an inline-six are not the same job, so current pricing lives on the service offers page.
