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Year Make/Model Repair Frequencysuccessful repair trips per 100 cars per year Compared to all models for the same year  
2014 Kia Optima   14 Optimas, 8.5 months of data per Optima, average 7600 miles

* Very small sample size.
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or 14 Optimas, 8.5 months of data per Optima, average 7600 miles

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2013 Kia Optima 59 Optimas, 8.8 months of data per Optima, average 22100 miles30
30% 30% Fewest Trips Most Trips
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2012 Kia Optima 53 Optimas, 9.2 months of data per Optima, average 38000 miles49
50% 50% Fewest Trips Most Trips
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2011 Kia Optima 26 Optimas, 9.0 months of data per Optima, average 40100 miles

Redesigned for this model year.
26
20% 20% Fewest Trips Most Trips
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2009 Nissan 370Z   17 370Zs, 9.5 months of data per 370Z, average 42400 miles

* Small sample size.
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2008 Nissan 350Z   10 350Zs, 9.7 months of data per 350Z, average 45700 miles

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2007 Kia Optima   12 Optimas, 7.3 months of data per Optima, average 91400 miles

* Very small sample size.
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2007 Nissan 350Z   11 350Zs, 9.1 months of data per 350Z, average 47000 miles

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2006 Nissan 350Z   11 350Zs, 7.9 months of data per 350Z, average 59800 miles

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2005 Kia Optima   11 Optimas, 7.7 months of data per Optima, average 117900 miles

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2005 Nissan 350Z   15 350Zs, 9.8 months of data per 350Z, average 69600 miles

* Small sample size.
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2004 Kia Optima   18 Optimas, 8.5 months of data per Optima, average 126500 miles

* Small sample size.
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2004 Nissan 350Z 27 350Zs, 8.8 months of data per 350Z, average 77800 miles

Like other sports cars, low average odometer reading.
40
0% 0% Fewest Trips Most Trips
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2003 Nissan 350Z 27 350Zs, 9.8 months of data per 350Z, average 98900 miles

First model year.
95
50% 50% Fewest Trips Most Trips
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See reliability results for all Hatchbacks, Convertibles, and Sedans.
See reliability results for all Nissan and Kia vehicles.

Nissan 350Z / 370Z vs. Kia Optima Reliability Comparisons

You won't find Nissan 350Z / 370Z or Kia Optima reliability information like this anywhere else. Actual repair frequencies, not just vague dots, to make it clear how much the Nissan 350Z / 370Z and the Kia Optima truly differ in reliability.

These stats are promptly updated four times a year, to much more closely track Nissan 350Z / 370Z and Kia Optima reliability as the cars age. Others tell you how reliable the Nissan 350Z / 370Z and the Kia Optima were a year ago, when the cars were a year younger and had 12,000 fewer miles on them. Only TrueDelta tells you how reliable the Nissan 350Z / 370Z and the Kia Optima have been recently.

What People Are Saying about Reliability and the Nissan 350Z / 370Z

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What Our Members Are Saying about the Reliability and Durability of the Nissan 350Z / 370Z

Nissan 350Z / 370Z Reliability and Durability: Pros
YearBody/PowertrainComment
2009 2dr Hatch 332-horsepower 3.7L V6
6-speed manual RWD
My last two Nissans have each gone over 150,000 miles. Both were easy keepers, reliable, and inexpensive to service. I expect the same from this one. Servicing costs on the Cayman are a nightmare by comparison, despite long recommended service interval
2008 2dr Hatch 323-horsepower 3.7L V6
7-speed shiftable automatic RWD
Very reliable, have not had long enough to evaluate durability.
2007 2dr Convertible 323-horsepower 3.7L V6
7-speed shiftable automatic RWD
I drove this car in 15 degree weather, It cranked up the same as 80-90 degree days
2006 2dr Convertible So far no problems.
2005 2dr Hatch 323-horsepower 3.7L V6
7-speed shiftable automatic RWD
nissans have always been know to be well built and reliable.
2004 2dr Hatch 323-horsepower 3.7L V6
6-speed manual RWD
Strong, durable engine and drivetrain. Have only had standard maintenance - no repairs. This includes taking the car to the track and autocross on occasion.
2004 2dr Hatch 323-horsepower 3.7L V6
6-speed manual RWD
I bought mine with about 160,000 miles on it kind of as a toy as I didn't anticipate having a 400 mile a week commute. Through all that though it has been dead reliable. Here are the only issues I've had with it: - Clutch needed to be bled as pedal would sink to floor in hot weather (still operable though) - Replaced/upgraded brakes - Alignment was way out of whack and feathering front tires (common problem) - Driver's side window motor failed the day I bought it (fixed obviously, common problem, no issues since with OEM Nissan replacement) - Trunk latch and dampers were shot and needed to be replaced It starts up and runs like clockwork. I could see this car going another 100K miles in the hands of the right owner.
2004 2dr Hatch 323-horsepower 3.7L V6
7-speed shiftable automatic RWD
never had to do any major repairs on my Z
2004 2dr Hatch 323-horsepower 3.7L V6
7-speed shiftable automatic RWD
Relatively cheap to maintan for a sportscar. Nissan engines can run pretty high in mileage and be just fine.
2003 2dr Hatch 323-horsepower 3.7L V6
6-speed manual RWD
daily driver with only 2 small blips requiring attention
Nissan 350Z / 370Z Reliability and Durability: Cons
YearBody/PowertrainComment
2011 2dr Hatch 332-horsepower 3.7L V6
6-speed manual RWD
Engine is a hit or miss with oil consumption.
 

What Our Members Are Saying about the Reliability and Durability of the Kia Optima

Kia Optima Reliability and Durability: Pros
YearBody/PowertrainComment
2008 4dr Sedan 192-horsepower 2.4L I4
6-speed shiftable automatic FWD
I researched online and spoke with Optima owners. Kia has come a long way in reliability in the past few years. I was surprised by the level of owner loyalty. People who own Optimas enthusiastically recommend them.
2008 4dr Sedan 192-horsepower 2.4L I4
6-speed manual FWD
Good general reliability, which is backed by an excellent warranty
2007 4dr Sedan turbocharged 274hp 2.0L I4
6-speed shiftable automatic FWD
I have had zero problems with the car. Trim and everything is just like new.
2005 4dr Sedan turbocharged 274hp 2.0L I4
6-speed shiftable automatic FWD
Have not had to call roadside service once in three years
2004 4dr Sedan 192-horsepower 2.4L I4
6-speed manual FWD
Have had 0 problems until just recently the clutch pressure plate broke! $800 to fix and not under warranty! Not happy about that.