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2018 · Mazda
2018 Mazda Mazda3 parts sizes
What the official 2018 Mazda Mazda3 owner's manual prints for replacement parts: bulbs, battery and oil. Every value below is copied from the manual.
- bulbs
- battery
- oil
- 1Low beam H11 · high 9005
- 2Battery Q-85
2018 Mazda Mazda3 owner's manual
Source: the official 2018 Mazda3 owner's manual (the maker's web edition). Engines named in the parts tables: SKYACTIV-G 2.0 and SKYACTIV-G 2.5.
Exterior bulbs
| Position | Bulb | Watts | Manual |
|---|---|---|---|
| High beam headlamp (halogen) (ECE HB3) | 9005 | 65 W | web page |
| Low beam headlamp (halogen) (ECE H11) | H11 | 55 W | web page |
| Daytime running lights (halogen headlight trims) (ECE HB3) | 9005 | 65 W | web page |
| Parking lights/Front side-marker lights (halogen headlight trims) (ECE WY5W; no SAE number printed) | WY5W | 5 W | web page |
| Front turn signal lights (ECE WY21W) | 7443NA | 21 W | web page |
| Rear turn signal lights (ECE WY21W) | 7443NA | 21 W | web page |
| Brake lights/Taillights/Rear side-marker lights (LED-type trims also list bulb type) (ECE W21/5W) | 7443 | 21/5 W | web page |
| Reverse lights (4-door) (ECE W16W) | 921 | 18 W | web page |
| Reverse lights (5-door) (ECE W21W) | 7440 | 21 W | web page |
| License plate lights (ECE W5W; no SAE number printed) | W5W | 5 W | web page |
Battery
| Printed | BCI group | Notes | Manual |
|---|---|---|---|
| Q-85 | not printed | i-ELOOP system: only Q-85 should be used; also lists 12V-60Ah/20HR or 12V-65Ah/20HR | web page |
Engine oil
The manual specifies the oil grade on its capacities page: 4.4 US qt with filter for SKYACTIV-G 2.0; 4.8 US qt with filter for SKYACTIV-G 2.5 (oil grade not printed in extracted sections (refers to Recommended Oil)) — web page.
How the 2018 compares with nearby years
Against the 2017 Mazda3: The low-beam bulb and high-beam bulb are the same in both manuals.
The H11 low-beam bulb appears in every Mazda3 manual from 2015 to 2018 that this site has read (4 model years).
Shared with other 2018 models
- 9005 (high beam headlamp (halogen) and daytime running lights (halogen headlight trims)): 7 other 2018 models list it, including Ford Escape, Ford Explorer, Ford F-150, Ford Transit, Toyota 4Runner, Toyota Highlander.
- H11 (low beam headlamp (halogen)): 17 other 2018 models list it, including Ford Escape, Ford F-150, Ford Transit, Honda CR-V, Honda Civic, Honda Odyssey.
- WY5W (parking lights/front side-marker lights (halogen headlight trims)): no other 2018 model this site has read lists it.
- 7443 (front turn signal lights, rear turn signal lights and brake lights/taillights/rear side-marker lights (led-type trims also list bulb type)): 5 other 2018 models list it, including Mazda CX-5, Toyota Corolla, Toyota RAV4, Toyota Sienna, Toyota Tacoma.
- 921 (reverse lights (4-door)): 11 other 2018 models list it, including Ford Escape, Ford F-150, Nissan Altima, Nissan Frontier, Nissan Rogue, Toyota Camry.
- 7440 (reverse lights (5-door)): 2 other 2018 models list it, including Toyota Corolla Hatchback, Toyota Tundra.
- W5W (license plate lights): 16 other 2018 models list it, including Ford Escape, Ford Explorer, Ford F-150, Ford Transit, Mazda CX-5, Nissan Altima.
A shared number means the same replacement part fits both cars, so one spare can cover two cars in the household.
What the manual does not print
The 2018 Mazda Mazda3 owner's manual does not list wipers and filters sizes; for wipers, measure each blade end to end and buy the nearest whole-inch size.
Buying the parts for a 2018 Mazda3
- Headlight bulbs: the H11 low beam and the 9005 high beam are halogen capsules on trims that have them; buy them in pairs so both sides match in colour and output.
- Small bulbs: this manual names 10 replaceable bulb positions. Wedge bulbs such as W5W and 194 differ from twist-socket bulbs such as 7443 or 3157, so match the full number, including suffixes like NA (amber).
- Battery: the manual prints Q-85. Match the cold cranking amps on the old label or higher, and keep the terminals on the same sides.
Check it on your car
Trim, engine and lighting package change some of these parts, so match the row that names your engine or trim. Before you buy, compare the number printed on the old part with the table above. See how this site reads manuals.
Other Mazda3 years
All Mazda Mazda3 years in one table