Mazda62021Overview/mazda/6/2021/base/

2021 Mazda 6

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2021 6.

Transmission Automatic (S6)

The 2021 Mazda 6 pairs its turbocharged engine with an automatic (S6) transmission, carrying oil viscosity specifications of 5W-30 or 0W-20 and EPA fuel economy ratings of 26/35/29 mpg. Reliability records for this model year document zero recalls and just 17 total owner complaints, establishing a low-incident profile within the model's history. Researchers should note that engine-related issues constitute the top complaint area among those reports, marking the primary reliability consideration for this specific vintage.

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Engine oil capacityTurboOEM · verified
Engine oil type5W-30 / 0W-20OEM · verified
Lug nut torque80.0-108.0 ft-lbsOEM · verified
EPA fuel economy26/35/29 mpgEPA · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 35 · 520 CCA battery, OE oil filter 1WPY14302. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 35 · 520 CCAOEM · verified
Tail / brake / turnFUSEOEM · verified
Tire sizeP225/45R19 92WOEM · verified
Wheel / rim7.5 inOEM · verified

OE service part numbers OEM · verified

Engine oil filter1WPY14302 alt 1WPE14302
Engine air filterPY8W133A0 alt PE07133A0A
Spark plugPE5R18110A alt PY8V18110
Battery0000800035WB
Front wiper bladesGBFN67330 alt GBEF67330
Serpentine beltPY0115908 alt P30115908
ThermostatP50215171 alt PYFD1516ZA

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic (S6)

Dimensions & weight NHTSA vPIC

Overall length192.5 in
Overall width72.4 in
Overall height57.1 in
Wheelbase111.4 in
Curb weight3250 lb
Track (front / rear)62.6 / 62.2 in
Weight distribution (front / rear)59/41

Ratings & economy EPA / vPIC

EPA city / highway / combined26 / 35 / 29 mpg
DrivetrainFront-Wheel Drive
Passenger volume100 cu ft
Cargo volume15 cu ft
Recommended fuelRegular Gasoline

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine holds Turbo of 5W-30 / 0W-20 engine oil, Mazda Long Life Hypoid Gear Oil SG1 in the differential, DOT 3 brake fluid. Torque lug nuts to 80.0-108.0 ft-lbs, the oil drain plug to Use a new washer: 23.0-30.0 ft-lbs. The firing order is 1-3-4-2.

Lubricants & capacities

Automatic Transmission FluidATF
Automatic Transmission Fluid Capacity8.4 qt
Automatic Transmission FluidATF
Brake FluidDOT 3
Brake FluidDOT 3
Differential Gear OilMazda Long Life Hypoid Gear Oil SG1
Differential Gear OilMazda Long Life Hypoid Gear Oil SG1
Engine CoolantCheck Coolant Cap: If marked FL-22 use FL-22

Engine torques

Engine Flywheel Bolts80.0-85.0 ft-lbs
Exhaust Manifold to Cylinder Head Bolts32.0-47.0 ft-lbs
Engine Oil Pan Drain PlugUse a new washer: 23.0-30.0 ft-lbs
Engine Oil Pan Drain PlugUse a new washer: 23.0-30.0 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs15.0-19.0 ft-lbs

Chassis torques

Differential Fill PlugFinal Drive: 30.0-39.0 ft-lbs
Differential Fill PlugFinal Drive: 30.0-39.0 ft-lbs
Lug Nuts80.0-108.0 ft-lbs

Ignition

Cylinder Firing Order1-3-4-2
Curb Idle Speed (No Load)Setting Speed: 700 rpm
Curb Idle Speed Variance (No Load)50 rpm
Curb Idle Speed Variance (Secondary Under Load)Electrical Speed-Up: 50, AC Speed-Up: 75 rpm
Curb Idle Speed Variance (No Load)50 rpm
Curb Idle Speed Variance (Secondary Under Load)75 rpm
Spark Plug ManufacturerMazda
Spark Plug GapPlug PE01

Battery & A/C

Oil GroupPAG
Oil TypeR-134a: Pag 46; R-1234yf: Pag 46YF
Oil Capacity3.38 oz
Standard BCI Group Number35
Standard BCI Cranking Performance520 cca

Service checks

Engine Oil Pressure57-94 psi
Engine Oil Pressure RPM3000 rpm
Intake Valve Lash0.009-0.011 in
Exhaust Valve Lash0.011-0.012 in

Brakes

Brake Caliper Bolt to Carrier Torque23.0-28.0
Brake Caliper Carrier to Hub Bolt TorqueFront: 68.0-; Rear: 63.0-
ABS Sensor Torque6.5
Minimum Pad ThicknessTurbo: 0.059" in
Minimum Pad ThicknessNon Turbo: 0.079" in
Vented Rotor Minimum Thickness for ReplacementFront: 1.020; Rear: .310
Vented Rotor Minimum Thickness after RefinishFront: 1.060; Rear: .350
Variation from Parallelism Thickness Variation.0006"

Multi-step torque procedures OEM · verified

Camshaft Bearing/Carrier Cap Bolts or Studs — tightening sequence 1 stages
127.0-53.0 inch lbs., Step 2: 71.0-97.0 inch lbs.27–53 in
Connecting Rod (Large End) Bearings — tightening sequence 1 stages
120.0-23.0 ft. lbs., Step 2: 80-100°20–23 ft. lbs
Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages
167.0-81.0 ft. lbs., Step 2: 55-65°67–81 ft. lbs
Cylinder Head — tightening sequence 1 stages
19.5-12.5 ft. lbs., Step 2: 32.0-34.0 ft. lbs., Step 3: 85-95°, Step 4: 85-95°9.5–12.5 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter every 7,500 mi; spark plugs every 75,000 mi; coolant at 120,000 mi. The big-interval services (at 120,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

Every 7,500 miBrake Linings (inspect) · Brake Rotor (inspect) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Tire & Wheel Assembly (rotate)
Every 15,000 miBody Fasteners (torque) · Brake Line (inspect) · CV Joint Boot (inspect) · Cabin Air Filter (replace) · Fuel Line (inspect) · Steering Linkage (inspect)
Every 22,500 miAccessory Drive Belt (inspect) · Engine Air Filter Element (replace)
Every 30,000 miFuel Evaporative Emission Control System Lines (inspect)
Every 37,500 miExhaust System (Complete) (inspect) · Exhaust System Heat Shield (inspect)
Every 75,000 miSpark Plugs (replace)
At 120,000 miEngine Coolant System (drain, flush & refill)
At 180,000 miEngine Coolant System (drain, flush & refill)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

Owner complaints about the 2021 Mazda 6 dominate in one area — the engine, 11 of 17 reports (65%), well ahead of the next concern. NHTSA has issued no recalls for this vehicle, so these are owner-reported concerns only. 0 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the engine pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.

0
Open recalls
NHTSA campaigns
300
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
17
Owner complaints
0 involved a crash · 0 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Overall★★★★★
Frontal★★★★★
Side★★★★★
Rollover★★★★

Owner complaints filed with NHTSA, by component

All 17 complaints on record, top 6 components.

Engine11
Visibility/Wiper2
Back Over Prevention1
Unknown Or Other1
Engine,Fuel/Propulsion System1
Unknown Or Other,Engine1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

No recall campaigns on record with NHTSA for this vehicle as of the last data refresh.

Technical service bulletins NHTSA · verified

Showing 5 of 300 bulletins on record with NHTSA.

BulletinDateComponentSummary
SA-041-262026-06-18Electrical SystemThis SA supersedes the previously issued SA(s) listed below. The changes are noted in…
09-019-262026-06-17Electrical SystemThis bulletin supersedes the previously issued bulletin(s) listed below. The changes are…
SA-027-26a2026-06-16Electrical SystemThis SA supersedes the previously issued bulletin(s) listed below. The changes are noted…
SA-031-262026-04-30StructureDESCRIPTION Some vehicles may require the replacement of a damaged VIN plate or vehicle…
SSPD5 Parts Warr b2026-04-29EngineValve Stem Seals Class Action Settlement Program for Excessive Oil Consumption and Oil…

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420
Catalyst system efficiency below threshold — Bank 1
P0300
Random / multiple cylinder misfire detected
P0171
System too lean — Bank 1
P0455
Evaporative emission system leak detected — large leak
P0128
Coolant thermostat below regulating temperature
P0442
Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN
Decode a VIN to confirm the transmission and build data for a specific 6. OEM
Build data
Plant, GVWR class, engine and body data for any 17-character VIN.
Recalls
Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Reference guides

Cross-vehicle references for the kinds of data on this page.

Frequently asked

How much oil does the 2021 6 take?

Turbo of Turbo: 5W-30; Non Turbo: 0W-20, per the factory manual.

Does the 2021 6 have open recalls?

NHTSA lists 0 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the 6 get?

EPA figures are 26 city / 35 highway / 29 combined mpg.