With gas prices being as unpredictable as they are, many Americans are finding themselves drawn to a hybrid car—one that utilizes a battery paired with a combustion engine to maximize miles to the gallon. Since the average cost a brand-new hybrid is around $40,000, more are turning to the used car market.

Most mechanically inclined folk know hybrids are still excellent cars to buy new. However, there are a few used hybrids that many experienced technicians heavily warn against.

Whether it’s an expensive hybrid system repair, unreliability concerns, or other maintenance concerns, here are the five cars Mateo, a mechanic with over 10 years of experience, told GoBankingRates never to buy.

The Chrysler Pacifica is the newest hybrid he warns against

The first hybrid minivan in America is the most modern Mateo said should be avoided. He says Chrysler‘s hybrid system is the biggest pain point, with multiple related hybrids and TSBs. With all the tech involved, it can be incredibly costly to own.

“The Pacifica Hybrid has had multiple recalls related to its battery and electrical system,” he said. “Some of my customers with this car have had to deal with stalling issues and charging problems.”

The years affected are, well, all of them. Starting from 2017 to the most recent model year.

Another American car makes the list—the Chevy Malibu Hybrid

Chevy is known for its tough trucks, giant family SUVs, and the Volt. However, it isn’t very well known for its hybrids—especially used. That’s because, Mateo says, GM essentially stopped investing heavily in them, and there are very few people who know how to repair them.

“The problem with the Malibu Hybrid is that it has a weak resale value and limited support for repairs,” he said. “GM didn’t commit to hybrids the way Toyota or Honda did, so finding mechanics who specialize in these cars can be kinda hard.”

He also cautioned against the car’s start-stop system, which tends to wear down the components over extended periods of time. Then, it makes for an expensive trip to the shop for 2016 to 2019 owners.

The Nissan Rogue Hybrid is next

The Nissan Rogue didn’t quite catch on, Mateo says, and he never understood why people bought them new. Especially since the hybridization of the little SUV did little to increase the miles per gallon.

“This was one of those hybrids that just didn’t really make sense to me,” he said. “The fuel economy gains were barely noticeable compared to the standard Rogue, and the hybrid system itself had so many software and transmission issues.”

The discontinuation of the Rogue made it even harder to own since OEM parts are harder to obtain now. So, those in the market for a used hybrid may want to take a few steps back and away from the Rogue hybrid. Especially those from 2017 to 2019.

Looking for a used Hyundai Sonata Hybrid? Maybe don’t

If you’ve been eyeing a 2011 to 2015 Hyundai Sonata Hybrid, Mateo strongly urges you to think again. The main issue, he says, is how glitchy and unreliable Hyundai’s early hybrids were.

The lack of experience in that arena led to the early failure of key drive components, like the transmission.

“Hyundai had a lot of problems with their hybrid system in the early days,” he said. “The transmission and hybrid components weren’t that great, and a lot of owners ended up dealing with expensive replacements before hitting 100,000 miles.”

The current hybrids Hyundai offers, however, are rated very well. So, thankfully the company has learned from their mistakes.

The Ford Escape Hybrid is the oldest used car to avoid

Ford may be kicking butt in the EV industry, but the Ford Escape was a blush in the company’s hybridization history. If you’re shopping for used Escape hybrids from 2005 to 2012 due to the low price and high miles per gallon, don’t be fooled—Mateo says it has an expensive trick up its sleeve.

“I’ve seen so many of these come in with failing battery packs,” explained Mateo. “Replacing them can cost up to, and sometimes over, $5,000, which is more than what some of these older models are worth today.”

He also noted the Ford’s tendency to need a new transmission and experience other annoying and pricey electronic issues.