Wholesale values “took a turn south” last week and posted the year’s most dramatic weekly decline yet, according to Black Book’s Ricky Beggs.

What’s more, the proportion of wholesale value adjustments that were positive changes was the smallest it has been in four weeks, he noted.

The overall change was a decrease of $52. The last time the week-over-week drop was so high was the final week of last year.  On average, there were 1,405 daily value adjustments. This tally represents the second-highest sum in the last six weeks.

But just 41 percent of those changes were positive, Beggs pointed out.

“This past week both the car and truck segments took a turn south in overall average change,” he said in the latest “Beggs On the Used Car Market” video report.”

On the car side of the market, all 10 segments declined.

“This was the first time in the past four weeks with no car segments increasing in the change amount,” Beggs highlighted, pointing out that the entry-level car segment (down $7) and the compact car segment (down $8) had the most moderate declines.

Moving over to trucks, one of the 14 segments — full-size SUVs (up $4) — showed an increase, with five down just single digits. The most moderate of these was the crossover class, which fell $2.

“Even the largest declining segments were not at ‘fall off the table’ amounts,” Beggs said referring to the luxury SUV segment (down $58) and the compact crossover class (down $53).

Offering some additional insight into what Black Book editors discovered in the wholesale market last week, Beggs said there were “a variety of reactions” to the week.

“It was confirmed almost across the board that tax season money is not appearing in full force yet. The tax cars are not always the front-line-ready models,” he noted. “These truly front-line vehicles — whether tax season or not — that are in great condition with very good miles, are in demand and bringing solid money in relation to book values.”

In fact, Beggs pointed out that a significant share of the upward-moving vehicle values last week were from this crop of vehicles.

“When two vehicles that are almost identical cross the block, one brings good money with multiple bidders going after the car. The other gets less attention and much less money, if it does actually sell,” he continued. “The difference is the excessive miles for the model year. There is also a resulting difference when there is an oversupply of a single model filling the auction pipelines.”

Sharing some more market perspective, Beggs went on to note that Black Book has placed market-driven values on five vehicles from model-year 2012 and expects to continue doing so.

“Be looking for more of these 2012s with market-driven values as they appear in the used market," he added.

Beggs’ video can be viewed below.