CERTIFICATES of entitlement (COE) slid across the board on Wednesday, with car premiums closing at one of the year's lowest levels.

COE for cars up to 1,600cc registered the biggest fall, dropping 11.3 per cent to $12,501. COE for cars above 1,600cc was next, falling 9.5 per cent to $12,889.

The Open COE, used mainly for cars, ended 5.1 per cent lower at $14,101.

COE for commercial vehicles dipped by 0.6 per cent to $12,589, while motorcycle COE fell by 5.1 per cent to $1,413.