The 678,169 certified pre-owned sales in the second quarter represents a best-ever sum, says Autodata Corp.

Releasing CPO results on Tuesday afternoon, Autodata said there were 223,560 certified sales in June, which beats year-ago figures by 5 percent.

The daily sales rate was 8,598, compared to 8,519 in June 2015.

This completes the first half of 2016, in which dealers sold 1.32 million certified vehicles; this beats year-ago figures by 3.8 percent.

As for Q2, that record sum represents a 2.7-percent year-over-year improvement and is 4.9 percent stronger than the first quarter.

Kia had its best month ever, as did Land Rover, according to Autodata. 

Kia sold 7,403 CPO units in June (up 21 percent). Land Rover sold 1,675 certified vehicles for the month (up 25.7 percent).  

Asian brands led the way in June, selling 110,283 CPO vehicles for a 12.6-percent year-over-year increase. Year-to-date, they have moved 636,724 certified rides (up 9.7 percent).

European-brand CPO sales came in at 35,994 for the month (essentially even with year-ago figures) and their first-half sales reached 214,520 units (down 3.3 percent).

The Big 3 moved 77,283 CPO vehicles for June (down 2.2 percent). Their sales in the first half of the year (473,283) were relatively even with year-ago numbers (473,444).