Summer’s End Puts Retention Index on Downward Track
‘Market strength is waning’ for used vehicles after a strong summer, a trend that is likely to continue through the end of the year, according to the latest report from Black Book.

Black Book analysts say retained values for used vehicles fell in September after peaking in August.
Photo by Craig Adderley via Pexels
LAWRENCEVILLE, Ga. — Valuation and value forecast solutions provider Black Book (div. Hearst) released its Used Vehicle Retention Index for September. The index fell to 115.9, a -0.6% change from August (116.6).
The index remains above the 115 registered in June and July. It increased 1.4% in August, a month in which subcompacts led the charge with a 2.1% gain. The index appears to be following a seasonal pattern since a long, slow decline that began in June 2014 (128.1) and reached its nadir in May 2017 (112.3).
Read: Hot August: Subcompacts Lead 1.4% Gain in Retained Values
“The used market held up pretty well during summer when traditionally, the values have declined,” said Executive Vice President of Operations Anil Goyal. “However, we are now starting to see that the market strength is waning. We expect the index to continue to drop in the remaining months of the year.”
The Black Book Used Vehicle Retention Index is calculated using Black Book’s published wholesale average value on two- to six-year-old used vehicles, as percent of original typically equipped MSRP. It is weighted based on registration volume and adjusted for seasonality, vehicle age, mileage, and condition.
To read the full report, click here.
More Auto Finance

Auto Credit Plentiful
June numbers show lenders are readily granting access, including to risky borrowers, as consumers leverage themselves to take on high prices.
Read More →
Automotive Consumers Sink Further in Debt
Most financing metrics hit records in the second quarter as more buyers locked themselves into long terms and high monthly payments.
Read More →
Porsche Financial Services Shifts Structure
After 36 years with Porsche, the Financial Services Chief Financial Officer Konrad Riedl is retiring, and the department is realigning its management structure.
Read More →
Tariffs Could Raise Insurance Premiums
As U.S. import tariffs affect repair costs, consumers might find it more affordable to replace a damaged vehicle, according to recent Insurify tariff analysis.
Read More →
Smaller Loans, Longer Terms
The youngest generation of car buyers is more likely to finance less expensive vehicles, more than half of generation Z consumers borrowing less than $25,000.
Read More →
New Cars a Tad More Affordable
May averages show that combined circumstances gave auto consumers slightly better buying power for the month, though average prices were up year-over-year.
Read More →
First-Quarter Sees Long Auto Loan Growth
Experian data show more consumers are tapping the method, along with refinancings, to afford buying. Meanwhile, subprime borrowers are getting more access.
Read More →
Mastering Credit Friction
In this video, Josh Krach explains how to turn credit friction into an advantage.
Read More →
April Less Affordable
Based on prices, reduced incentives and slower household income growth, consumers found it more challenging to buy new last month, Cox Automotive reported.
Read More →
Auto Lenders, Consumers on a Tightrope
April borrowing data shows that more consumers are bending over backward to buy vehicles, though subprime lending cooled off for the month.
Read More →