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Wiper Blades
| Wiper Spec | BMW 3 Series | Mercedes-Benz C-Class |
|---|---|---|
| Driver | 26″ | 26″ |
| Passenger | 18″ | 19″ |
| Rear | N/A” | N/A” |
| Fitting Type | N/A | N/A |
Full BMW 3 Series wiper guide · Full Mercedes-Benz C-Class wiper guide
Headlight Bulbs
| Bulb Position | BMW 3 Series | Mercedes-Benz C-Class |
|---|---|---|
| Low Beam | N/A | N/A |
| High Beam | N/A | N/A |
| Front Indicator | N/A | N/A |
| Sidelights | W5W | W5W |
Full BMW 3 Series bulb guide · Full Mercedes-Benz C-Class bulb guide
Engine Oil
| Oil Spec | BMW 3 Series | Mercedes-Benz C-Class |
|---|---|---|
| Grade | 0W-30 | 0W-30 |
| Manufacturer Spec | BMW LL-04 | MB 229.52 |
| Capacity (with filter) | 5.5L | 6.0L |
| DPF-Safe | No | No |
Full BMW 3 Series oil guide · Full Mercedes-Benz C-Class oil guide
Cabin Filter
| Filter Spec | BMW 3 Series | Mercedes-Benz C-Class |
|---|---|---|
| Part Ref | N/A | N/A |
| Type | activated carbon | activated carbon |
| Change Interval | 20000 | 20000 |
Full BMW 3 Series filter guide · Full Mercedes-Benz C-Class filter guide
Car Battery
| Battery Spec | BMW 3 Series | Mercedes-Benz C-Class |
|---|---|---|
| Group | 115 (019 on the M340d) | 096 or 115 |
| Type | AGM | AGM |
| Ah | N/A | N/A |
| Start-Stop | Yes | Yes |
Full BMW 3 Series battery guide · Full Mercedes-Benz C-Class battery guide
Spark Plugs
| Spark Plug Spec | BMW 3 Series | Mercedes-Benz C-Class |
|---|---|---|
| Plug | NGK SILZKBR8D8S | NGK PLKR7A |
| Type | double iridium | platinum |
| Gap | 0.9 mm | 0.8 mm |
| Quantity | 4 | 4 |
Full BMW 3 Series spark plug guide · Full Mercedes-Benz C-Class spark plug guide
Estimated Annual Consumable Costs
Both the BMW 3 Series and Mercedes-Benz C-Class have similar consumable costs, but here’s roughly what to budget for DIY maintenance:
| Item | Typical Cost | Interval |
|---|---|---|
| Wiper Blades (set) | £15–30 | Annual |
| Headlight Bulbs (pair) | £8–30 | As needed |
| Engine Oil + Filter | £30–50 | Annual / 10K miles |
| Cabin Filter | £8–15 | 12–15K miles |
| Battery | £60–150 | Every 4–6 years |
| Spark Plugs | £15–40 | Every 30–80K miles |
Which Is Cheaper to Maintain?
For routine consumables like wipers, bulbs, and filters, the BMW 3 Series and Mercedes-Benz C-Class are very similar in cost. The key differences come down to:
- Oil spec — the BMW 3 Series uses 0W-30 while the Mercedes-Benz C-Class uses 0W-30. Some specs require pricier oil.
- Battery type — start-stop cars need EFB or AGM batteries which cost more than standard ones.
- Spark plugs — iridium plugs cost more but last much longer than standard copper.
In practice, both cars cost roughly £80–150 per year in consumables when you do the work yourself.
Frequently Asked Questions
Are BMW 3 Series parts more expensive than Mercedes-Benz C-Class?
For routine consumables (wipers, bulbs, oil, filters), costs are very similar between the BMW 3 Series and Mercedes-Benz C-Class. Both use widely available, competitively priced parts.
Can I use the same wiper blades on a BMW 3 Series and Mercedes-Benz C-Class?
Not necessarily. The BMW 3 Series uses 26″ driver / 18″ passenger blades while the Mercedes-Benz C-Class uses 26″ / 19″. Always check the exact sizes for your model.
Which car is easier to maintain at home?
Both the BMW 3 Series and Mercedes-Benz C-Class are straightforward for DIY maintenance. Changing wipers, bulbs, and cabin filters requires no special tools. Oil changes and spark plugs are also manageable with basic equipment.
Recommended Products
How we check fitment for this guide
We cross-reference fitment figures against manufacturer specifications and OE-supplier catalogue data where available, and matched to the standard codes that actually govern fit — battery type/group sizes, wiper lengths and fitting types, bulb fitment codes, tyre size markings, and oil specifications. We work by make, model, year, engine, and build date, because a single model can take different parts across its life. Where the right part depends on your exact vehicle, we tell you to confirm by registration or VIN. More on our method →