Open this photo in gallery Cars lined up in the lot of a Chevrolet dealership in Richmond, Va., on April 26, 2017. The used car market is set for significant growth. Steve Helber/The Associated Press

The balance of power in the used-car market is shifting towards shoppers as improved data and online offerings create more opportunities to push for the best price.

A fast-evolving online marketplace is providing more intelligence on the fair value of cars, said Cliff Banks, a Detroit-based auto retail expert.

“I don’t know that it can be any more transparent ... they all provide intelligence on the pricing and the deal of the vehicle, whether it’s a good deal, a fair deal.”

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Kijiji Canada recently announced it will add a stand-alone auto sales site that will roll out later this year to keep up with shifting expectations. The site will add reviews of dealers as well as market pricing information from Carproof.

“The key feature for us, and one of the biggest, the biggest win for us is what’s called price transparency or price analysis,” said Matt McKenzie, general manager at Kijiji Canada.

The online classified company, owned by eBay, already boasts of being the largest player in the Canadian market with about 500,000 vehicle listings. Autotrader, owned by Etobicoke-based Trader Corp., lists about 444,000 vehicles on its site while there are many other offerings on the market as well.

Listing companies are boosting their online presence as the used vehicle market is set for significant growth, said Dennis DesRosiers, president of DesRosiers Automotive Consultants.

“There’s tremendous opportunity, and that brings in all the different retail players and their approach of, how do I get a piece of that?”

While new vehicle sales are expected to be largely flat at about two million this year, the used-vehicle market is set to add half a million more in sales in the next three to five years, on top of the three million that changed hands last year, Mr. DesRosiers said.

The rise in the used-vehicle market comes as improved quality in the past decade means cars and trucks are lasting much longer, allowing for a potential lifespan of four to six owners from the two or three expected not long ago.

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“It takes 23 years to remove the vehicles from the road now, a decade ago it only took about 12, so it’s essentially doubled,” said Mr. DesRosiers.

Used vehicles also offer margins that are two to three times higher than for new cars, adding to their appeal, he said.

The quality and information improvements have significantly changed the overall used retail market, Mr. DesRosiers said.

“It’s not that far long ago, call it 15 years ago or maybe 10 years ago, where the used car market was largely a culture of deceit ... even if the online capacity was there, there was just so much riffraff in the used-car market that it was very dangerous. A lot of that has changed.”

The improved access to data means used-car retailers have to be more transparent and competitive about their pricing, said Jamie Tekela, director of pre-owned operations at Pfaff Automotive Partners.

“You need to really justify what you’re asking, why you’re asking it, and you can’t go asking $500 more for the same Honda Civic with the same mileage. It just it doesn’t work any more.”

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“It’s night and day, to be perfectly honest. It’s gotten a lot more customer-friendly,” he said.

The improved information on crash reports, comparable sales, and other metrics hasn’t done away with potential negotiations but does give more justification, Mr. Tekela said.

“There’s always going to be negotiations when trying to buy and sell vehicles but, with so much information available to each and every one of us, it’s a lot easier to explain our rhyme and reason why we’re asking what for a car.”