Fonterra is spending $27 million upgrading its fleet of tankers.
The cooperative is buying 76 new Volvo trucks which start arriving in the country this month.
Some of the 480 tankers in its fleet have reached the end of their life.
Fonterra says the new trucks are more efficient and have lower running costs.
National transport and logistics manager Barry McColl says 13 tankers will also be refurbished, extending their life by 2.5 years.
The upgrade will also see 86% of the fleet have electronic braking system and electronic stability control technology.
Mr McColl says it balances the braking between the truck and the trailer, giving the tanker a more stable braking system, and making it easier to handle on the road.