Engine Oil
5W-30
Conventional
Capacity
3.7 qt
with filter
3.4 qt without filter
Oil Filter
B6Y1-14-302A
Mazda (OEM)
OEM spec: API SN
The 2003 Mazda MX-5 Miata takes 5W-30 Conventional with a total capacity of 3.7 quarts (filter included). You’ll need a 17mm socket for the drain plug, torqued to 34 Nm. The OEM oil filter is the Mazda B6Y1-14-302A, with 2 compatible alternatives listed below. Below you’ll find complete maintenance specs, fluid capacities, parts, and links to buy what you need.
⚑ QUICK DIY TIPS FOR THE 2003 MAZDA MX-5 MIATA
Torque your drain plug to 34 Nm (25 ft-lbs) to avoid leaks or stripped threads. Using the OEM filter (Mazda B6Y1-14-302A) is recommended for warranty compliance. Always use 5W-30 Conventional as specified by Mazda — using the wrong viscosity can void your powertrain warranty. Check the maintenance schedule below for your next service interval. Viscosity 5W-30
Oil type Conventional
Capacity (with filter) 3.7 qt
Capacity (w/o filter) 3.4 qt
OEM spec API SN
Filter Options
Extra Guard oil filter
Drain Bolt & Hardware
Socket size 17 mm
Thread M14x1.5
Torque spec 34 Nm
Gasket Crush washer
NB (1.8L BP-Z3 I4)
Type Mazda ATF FZ
Capacity 3.7 qt
Change interval 60,000 mi
DOT type DOT 4
Change interval 30,000 mi
Type FL22
Color Green
Capacity 6 qt
Change interval 100,000 mi
Spark Plugs
Type Iridium
Gap 0.044
Quantity 4
Change interval 100,000 mi
Tires
Size 245/40R18
Front pressure 35 PSI
Rear pressure 35 PSI
Wiper Blades
Mazda NC10-67-330 driver
Buy Mazda NC11-67-330-9U passenger
Buy 5k mi 7.5k mi 10k mi 15k mi 20k mi 30k mi 50k mi 60k mi 90k mi 100k mi
≈ every 6 months
▸ Change Engine Oil & Filterspark plug
14mm thread, aluminum head
18 ft-lb · 24.4 Nm
All categories UNKNOWN OR OTHER POWER TRAIN ELECTRICAL SYSTEM
07-004-25 UNKNOWN OR OTHER 2025-04-25
A musty/mildew type odor may come from the vents when the air conditioning (A/C) system is operating. It is most noticeable when the A/C is first turned ON. This odor is the result of mold growth in the A/C evaporator/cooling unit which is caused by condensation, dust, and pollen within the cooling unit. This condition is usually worse during high humidity conditions. “Mazda Air Cooling Coil Coating” is available to encapsulate the mold to reduce odors. If the product is properly applied, it can effectively reduce the musty/mildew odor for up to three years.
07-004-25a UNKNOWN OR OTHER 2025-12-10
A musty/mildew type odor may come from the vents when the air conditioning (A/C) system is operating. It is most noticeable when the A/C is first turned ON. This odor is the result of mold growth in the A/C evaporator/cooling unit which is caused by condensation, dust, and pollen within the cooling unit. This condition is usually worse during high humidity conditions. “Mazda Air Cooling Coil Coating” is available to encapsulate the mold to reduce odors. If the product is properly applied, it can effectively reduce the musty/mildew odor for up to three years. NOTE: See parts information for Mazda Air Cooling Coil Coating and Kit part numbers.
SA-029-26 POWER TRAIN 2026-04-21
This Service Alert supersedes the previously issued SA listed below: The changes are noted in Red. SA-011/24 02/12/24, 06/06/24, 07/29/24 DESCRIPTION Mazda has developed factory recommended scheduled maintenance services that support all major vehicle systems. Mazda recommends dealers follow the scheduled maintenance tables as cited in the vehicle-specific workshop manual or owner's manual. Services performed outside of Mazda's factory scheduled maintenance are not recommended. These services are unnecessary and create unneeded expenses for your customers. SCHEDULED MAINTENANCE Refer to the applicable Workshop Manual or Owner's Manual for vehicle -specific manufacturer scheduled maintenance. Workshop Manual - Refer to section 00-00 SCHEDULED MAINTENANCE. Owner's Manual - Refer to section 8 Maintenance and Care. b. Note: Please refer to the information below outlining the services not included in Mazda's Factory Scheduled Maintenance: IMPORTANT: Recommending fluid flushes when not necessary can lead to customer confusion and dissatisfaction. Fluid flushing for preventive maintenance purposes is strongly discouraged, unless otherwise specified in a published procedure (Owner’s Manual, Workshop Manual, Technical Service Bulletin, etc.).
Show all 5 TSBs(+2) Private Party
$4,180–$4,620
Dealer Retail
$4,840–$5,500
Estimated values assume average condition and mileage for vehicle age.
Source: estimated
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