If you are just breaking-in the motor or for short OCI say 5k kms, its a waste of money going fully synthetic.

Newer oils based on dino or hydrocracked nowadays offers good additives comparable to esther or PAO based synthetics.

Its true that Fully Synthetics last longer, but who wants to change oil every 1 year on a new motor when the oil is already pit black and you are trying to convince yourself the oil is still good without any oil analysis to back it up?