Buick Regal maintenance: the schedule, the costs, the traps
A midsize sedan with a gas powertrain. Below: the service intervals with real cost ranges, the repairs Regal owners actually report, and the mileage windows worth buying ahead of - whether you are keeping it for yourself or putting it to work.
Service schedule
What it needs, and what that runs
| Interval | Service | Cost |
|---|---|---|
| 7,500 mi / 12 mo | Synthetic (dexos1) oil + filter; tire rotation; inspection | $80-$130 |
| 22,500 mi | Engine + cabin air filters; oil + rotation | $180-$320 |
| 45,000 mi | Brake fluid flush; filters; (severe: 6-speed fluid) | $280-$480 |
| 97,500 mi | Spark plugs; 6-speed (6T70) transmission fluid service | $400-$750 |
| 150,000 mi | Dex-Cool coolant flush; accessory belt | $250-$550 |
Known repair windows
What Regal 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.
2.0T LTG timing chain stretch
high severity80,000-130,000 mi · $1,800-$3,500
Cold-start rattle, P0008/P0017, loss of cam timing.
GDI intake-valve carbon buildup
medium severity60,000-120,000 mi · $400-$700
Walnut blast; rough idle/misfire.
6T70 torque-converter shudder / 2-6 flare
medium severity60,000-120,000 mi · $150-$3,500
Software update to full rebuild.
Turbo seals / PCV oil consumption
medium severity80,000-140,000 mi · $700-$2,000
Blue smoke, oil use.
eAssist battery (2.4L mild-hybrid trim)
medium severity70,000-130,000 mi · $1,500-$3,000
Only on eAssist variants.
Cost to keep
What it costs to own, by how long you keep it
Scheduled servicing only, from a brand-new Regal at 12,000 miles a year. Insurance, fuel, tires and depreciation are yours to add - this is the part the shop charges you for.
| You keep it | Odometer | Servicing | Per month |
|---|---|---|---|
| 1 year | 12,000 mi | $105 | $9 |
| 3 years | 36,000 mi | $565 | $16 |
| 5 years | 60,000 mi | $1,260 | $21 |
| 7 years | 84,000 mi | $1,720 | $20 |
| 10 years | 120,000 mi | $3,135 | $26 |
| 15 years | 180,000 mi | $4,965 | $28 |
Per-month can dip as the horizon lengthens - a major service lands in one year and then averages out across all the months after it. The left column is what you actually spend.
Beyond the schedule, the first big-ticket item this Regal is known for is eAssist battery (2.4L mild-hybrid trim) from about 70,000 miles ($1,500-$3,000). It is a range, not a certainty - but it is the number to have in your head at the dealership.
Operator notes
Last traditional Regal SEDAN (5th-gen ended 2017; 2018+ became Sportback/TourX only). 2.0L turbo (259 hp) or 2.4L eAssist; GS trim used 3.6L V6. Timing CHAIN, 6-speed 6T70. dexos1 synthetic.
When the smart money sells
Keeping it yourself, there is no cutoff - the table above runs to fifteen years. On fleet math, where a car has to keep earning, a gas Regal retires around 95,000 miles - but the exit window opens earlier here: 2.0T LTG timing chain stretch risk window ($1,800-$3,500) opens ~80,000 mi. 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.
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Running a Regal for income?
Carlyle scores the exact listing on cost per remaining mile and projected Turo income, so you know what this Regal earns before you buy it.
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