COE prices fell across the board at the latest tender on Wednesday.
The premium for cars up to 1,600cc fell by more than $2,000 to close at $16,747, while COE for cars above 1,600cc softened by around $1,000 to settle at $18,389.
Open COE, which can be used for any vehicle type but ends up mainly for cars, dipped by $900 to $19,000.
The premium for commercial vehicles finished at $16,989 - down from $18,110 two weeks ago. And the COE for motorbikes hit $902, from $931 previously.
Observers said the latest results - with the first across-the-board dips since supply was cut last month - could be because of lower buying interest.
Car buyers, used to the low prices seen in the first half of this year, are shying away from showrooms despite an all-round improvement in consumer sentiment.
