Here are the 19 most reliable used cars of 2018

Toyota won six categories, the most of any automaker, while General Motors came in second by winning five categories.These are the 19 most reliable used cars of 2018

The 2015 Buick LaCrosse was named the most reliable "large car."  (Buick)

J.D. Power released its 2018 US Vehicle Dependability Study in February.The study measures car reliability by surveying respondents who have owned 2015 model-year vehicles for three years.Toyota won six categories, the most of any automaker, while General Motors came in second by winning five categories.

The used car market can be difficult to navigate. Sometimes, it's tough to tell if a seller is unloading a car because it's time for an upgrade, or because it's underwhelming.

J.D. Power helps shed some light on that question with its annual vehicle dependability study, which measures how much customers like their cars over time.This year's survey, which was released in February, collected feedback from 38,896 respondents who had owned a 2015 model-year vehicle for three years and determined the most reliable cars in 19 categories. The resulting data was used to determine the number of problems experienced per 100 vehicles. The lower the score, the more reliable the car is.

Toyota won six categories, the most of any automaker, while General Motors came in second by winning five categories.

These are the winners in each of the 19 categories.

Small car: 2015 Kia Rio

Small car: 2015 Kia Rio  (Kia)

Small premium car: 2015 Lexus CT

Small premium car: 2015 Lexus CT  (Lexus)

Compact car: 2015 Toyota Prius

Compact car: 2015 Toyota Prius  (Toyota)

Compact premium car: 2015 Lexus ES

Compact premium car: 2015 Lexus ES  (Lexus)

Midsize car: 2015 Chevrolet Malibu

Midsize car: 2015 Chevrolet Malibu  (General Motors)

Midsize sporty car: 2015 Dodge Challenger

Midsize sporty car: 2015 Dodge Challenger  (High Gear Media)

Midsize premium car: 2015 Lexus GS

Midsize premium car: 2015 Lexus GS  (Lexus)

Large car: 2015 Buick LaCrosse

 (Buick)

Small SUV: 2015 Hyundai Tucson

Small SUV: 2015 Hyundai Tucson  (Hyundai)

Small premium SUV: 2015 Audi Q3

Small premium SUV: 2015 Audi Q3  (Audi)

Compact SUV: 2015 Chevrolet Equinox

Compact SUV: 2015 Chevrolet Equinox  (General Motors)

Compact premium SUV: 2015 Mercedes-Benz GLK-Class

Compact premium SUV: 2015 Mercedes-Benz GLK-Class  (Daimler)

Midsize pickup: 2015 Toyota Tacoma

Midsize pickup: 2015 Toyota Tacoma  (Toyota)

Midsize SUV: 2015 Chevrolet Traverse

Midsize SUV: 2015 Chevrolet Traverse  (Chevrolet)

Midsize premium SUV: 2015 Lexus RX

Midsize premium SUV: 2015 Lexus RX  (Lexus)

Minivan: 2015 Honda Odyssey

Minivan: 2015 Honda Odyssey  (Honda)

Large SUV: 2015 Ford Expedition

Large SUV: 2015 Ford Expedition  (Ford)

Large light duty pickup: 2015 Chevrolet Silverado

Large light duty pickup: 2015 Chevrolet Silverado  (Chevrolet)

Large heavy duty pickup: 2015 Ford Super Duty

Large heavy duty pickup: 2015 Ford Super Duty  (Ford)