BMW 4 Series maintenance: the schedule, the costs, the traps
A midsize sports coupe (also convertible) with a gas powertrain. Below: the service intervals with real cost ranges, the repairs 4 Series owners actually report, and when a fleet operator would sell. Same data Carlyle uses to score fleet buys.
Service schedule
What it needs, and what that runs
| Interval | Service | Typical cost |
|---|---|---|
| 10,000 mi / 12 mo | Synthetic oil + filter (LL-04); vehicle check; tire rotation | $140-$230 |
| 30,000 mi / 24 mo | Cabin micro-filter; engine air filter; brake fluid flush | $400-$620 |
| 60,000 mi | Spark plugs; air filters; inspection | $400-$720 |
| 100,000 mi | Coolant; ZF 8HP automatic fluid & pan; drive belt | $650-$1,150 |
Known repair windows
What 4 Series owners actually run into
Mileage ranges where these repairs typically show up. Buying above a window is not automatically a pass - it just needs to be priced in.
Oil filter housing gasket leak (B48/B58)
medium severity50,000-100,000 mi · $400-$800
Standard modern-BMW leak point
Electric water pump / thermostat failure
medium severity80,000-130,000 mi · $700-$1,100
Overheating/limp mode
B58 coolant valley/transfer pipe seepage (M440i)
low severity80,000-140,000 mi · $600-$1,200
Long-term; B58 very durable otherwise
Intake valve carbon buildup (GDI)
medium severity70,000-100,000 mi · $400-$600
Walnut blast
Convertible hardtop/retractable roof mechanism (430i/M440i Cabrio)
medium severity80,000-130,000 mi · $500-$2,000
G23 soft-top motor/hydraulic wear (convertible only)
Operator notes
G22 gen: 430i = B48 2.0T, M440i = B58 3.0T (48V mild-hybrid). Timing chain. i4 is the EV sibling (separate model/powertrain). ZF 8-speed 'lifetime' fluid — service ~80k. Synthetic oil, 1 yr/10k CBS.
When the smart money sells
On fleet math, a gas 4 Series retires around 95,000 miles. Carlyle's garage tracks this per car, against your actual odometer.
Cost ranges are typical US independent-shop estimates and vary by region and condition. Modeling, not mechanic advice - always confirm against your car's service records.
More BMW guides
Thinking about buying a 4 Series?
Carlyle scores the exact listing - price vs. useful miles left, projected Turo income in your market, and a straight buy-or-pass call.
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