Holden Colorado Engine Problems
Holden Colorado 2010: Oil leak
It's under warranty, so take it back and demand they repair it, the dealer's advice is rubbish.
Holden Colorado: Can I install an aftermarket chip to increase power for towing?
You say it’s new, but not how many kays it’s done. I would wait until it is properly run in before doing anything rash like fitting an aftermarket chip. While they can improve the economy and performance as you say, fitting the chip would void your warranty on the engine and the drivetrain. If you are concerned about the performance first consult your dealer.