Hi Nigel. There is no sure fire way of predicting when COE prices will increase or when it will decrease. However if you head on over to https://www.motorist.sg/coe-renewal we can help you find the best time to renew your COE and not lose out!
Just like how investment always give you a disclaimer, past result does not indicate future performance. There's no telling. If you're buying a new car, talk to your dealer and check out what's the guarantee coe cap and how many bids. If you're happy with the offer to ahead. Cheers