Is the Buick Regal more reliable than the KIA Optima?

Slightly, yes. Both earn a good standing, but the Regal draws fewer owner complaints per car sold. The Optima's file is dominated by engine oil loss, misfires, and some engine failures. Shop visits and the chance of a major repair are the same for both cars.

Which has more recalls, the Regal or the Optima?

The Regal has more. Federal recall records show 8 recalls across its 2018 to 2020 model years, against 3 for the Optima. Recall count alone does not make a car less reliable. Check any car's VIN for open recalls before you buy.

Which costs less to repair, the Regal or the Optima?

The Optima costs less. Independent repair-cost data shows $471 a year for the Optima and $563 for the Regal, a gap of about $460 over five years. Both average 0.2 unscheduled shop visits a year and carry a 12% chance that a repair is major.

What is the biggest problem with the KIA Optima?

Oil loss is the biggest. Owners report oil vanishing between changes with no visible leak, then fouled plugs, misfires, and rough idle. Some cases end in a failed valve, metal in the engine, or complete failure. A few reports describe engine fires, so oil records matter on a used one.

Last updated: 2026-10-10

Buick Regal vs Kia Optima: Reliability Compared

More Reliable

Buick Regal

Good

Kia Optima

Good

Used shoppers get a slight reliability edge from the Buick Regal over the KIA Optima. Owners file far fewer complaints about the Regal per car sold, and the Optima's most common one is engine oil disappearing between changes. The Optima does cost less to repair each year.

How Do the Buick Regal and Kia Optima Generations Compare?

All three Regal years you are likely to see, 2018 to 2020, belong to the sixth generation. The data marks 2020 as the final production year of that run, so a 2020 is the newest and most developed Regal you can buy used. The Optima's 2018 to 2020 years sit in the fourth generation, which started in 2016. A first facelift arrived in 2018, so every year in this comparison is a post-facelift car at the late end of that generation. The fifth generation began with the 2021 model year.

Verdict

The Buick Regal is more reliable than the Kia Optima, scoring 74/100 vs 71/100.

A slight edge goes to the Buick Regal. Both cars sit at a good reliability standing, and they match on shop-visit rate and on the chance a repair is major. The gap comes from owner complaints. The Optima draws far more of them per car sold, and its most common one is oil vanishing between changes, which in some cases ends in engine failure. The Regal carries more recalls and a higher repair bill, so its lead stays narrow.

Key Differences

1Kia Optima costs $92 less per year to repair
2Buick Regal has 8.8 fewer complaints per 10k sold
3Kia Optima has 5 fewer total recalls

Category Scoreboard

2Buick Regal

—

2Kia Optima

Reliability ScoreTotal RecallsComplaint RateAnnual Repair CostRepair FrequencyMajor Repair Risk

Buick Regal vs Kia Optima: Which Is More Reliable?

Buick Regal vs Kia Optima at-a-glance reliability comparison
Metric	Buick Regal	Kia Optima
Reliability Score	74/100	71/100
Years Tracked	3	3
Total Recalls	8	3
Complaints per 10k Sold	14.5	23.3
Annual Repair Cost	$563/yr	$471/yr
Repair Frequency	0.2/yr	0.2/yr
Major Repair Risk	12%	12%
Year Wins	3	0

What Are the Common Problems With the Buick Regal and Kia Optima?

Engine trouble separates these two cars. Optima owners report oil vanishing with no visible leak, fouled plugs, misfires, failed valves, and some fires. Regal complaints are few and scattered: the stop-start system stalling at red lights and restarting with a jolt, a false "Shift to Park" message that can drain the battery, and a brake pedal that turns hard. The Optima also has crash-linked reports in its engine, power train, and air bag areas, where owners say bags did not deploy. Both cars have crash-linked brake complaints.

Buick Regal vs Kia Optima common problem areas comparison
Component	Buick Regal	Kia Optima
ENGINE	—None	8.5Above Avg
ELECTRICAL SYSTEM	2.6Low	2.3Low
UNKNOWN OR OTHER	1.5Low	2.6Low
POWER TRAIN	1.5Low	2.4Low
SERVICE BRAKES	1.9Low	1.1Low
AIR BAGS	—None	1.1Low
VEHICLE SPEED CONTROL	0.7Very Low	0.2Very Low
ENGINE AND ENGINE COOLING	—None	0.8Very Low
STRUCTURE	—None	0.8Very Low
SUSPENSION	0.7Very Low	—None
STEERING	—None	0.6Very Low
FORWARD COLLISION AVOIDANCE	—None	0.4Very Low
EXTERIOR LIGHTING	—None	0.4Very Low
FUEL/PROPULSION SYSTEM	—None	0.3Very Low
SEAT BELTS	—None	0.1Very Low

Complaints per 10,000 units sold, aggregated across all tracked model years from NHTSA owner reports.

Which Is Cheaper to Maintain: Buick Regal or Kia Optima?

Repair costs run lower on the Optima. Independent repair-cost data puts its yearly repair cost at $471 against $563 for the Regal. That is $92 a year, or about $460 over five years. Neither car pulls ahead on frequency or severity. Each averages 0.2 unscheduled shop visits a year, and each has a 12% chance that a repair is major. The savings are modest, and one engine failure on an Optima would erase them.

How Does Buick Regal vs Kia Optima Reliability Compare by Year?

Buick Regal vs Kia Optima year-by-year reliability scores
Year	Buick Regal	Kia Optima	Edge
2020	75/1002R / 2C	72/1000R / 138C	Buick Regal
2019	73/1003R / 18C	72/1001R / 205C	Buick Regal
2018	74/1003R / 19C	70/1002R / 230C	Buick Regal

Best years to cross-shop: The 2020 Buick Regal scored 75/100 and the 2020 Kia Optima scored 72/100 — the strongest shared model years that have been on the road for at least two years, where available.

Who Should Buy the Buick Regal vs the Kia Optima?

Pick the Regal if you want the cleaner complaint record and plan to keep the car for years. Owners rarely report the engine trouble that dominates the Optima file. Look at the 2020 first, which ranks among its strongest years, and be more careful with the 2019, which ranks among its weakest. Test the stop-start system and the shifter message on your drive, and ask whether any brake recall work was done. Pick the Optima if a lower repair bill matters most and you can check the car's history closely. Target the 2019, which ranks as its strongest year, and be wary of the 2018, which ranks among its weakest. Ask for oil change records, and check whether the owner has been adding oil between changes. Walk away from any car that burns oil, shows misfire history, or has had engine work, since those are the reports that end in failed engines.

Buick Regal vs Kia Optima: Common Questions

Is the Buick Regal more reliable than the KIA Optima?: Slightly, yes. Both earn a good standing, but the Regal draws fewer owner complaints per car sold. The Optima's file is dominated by engine oil loss, misfires, and some engine failures. Shop visits and the chance of a major repair are the same for both cars.
Which has more recalls, the Regal or the Optima?: The Regal has more. Federal recall records show 8 recalls across its 2018 to 2020 model years, against 3 for the Optima. Recall count alone does not make a car less reliable. Check any car's VIN for open recalls before you buy.
Which costs less to repair, the Regal or the Optima?: The Optima costs less. Independent repair-cost data shows $471 a year for the Optima and $563 for the Regal, a gap of about $460 over five years. Both average 0.2 unscheduled shop visits a year and carry a 12% chance that a repair is major.
What is the biggest problem with the KIA Optima?: Oil loss is the biggest. Owners report oil vanishing between changes with no visible leak, then fouled plugs, misfires, and rough idle. Some cases end in a failed valve, metal in the engine, or complete failure. A few reports describe engine fires, so oil records matter on a used one.
What problems do Buick Regal owners report?: Electrical and brake issues lead the list. Owners describe the stop-start system restarting late at red lights, a false "Shift to Park" message that can drain the battery, and a brake pedal that turns hard. Two brake complaints involve crashes. The total complaint count is low.

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More Kia Optima comparisons

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How we score the Buick Regal and Kia Optima

Scores weight complaint severity at 35%, repair costs at 30%, recall impact at 20%, and the spread of complaints across systems at 15%, with complaint counts adjusted for US sales. Read the full methodology.

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