With the law passed in 2018, only cars less than 5 years old can be registered in PNG. Those that were imported and registered prior to the law taking effect continue to be grandfathered in. So, your best be is to import a car newer than 5 years old or buy one in country that has been grandfathered in. Check the Classifieds as we just posted our Jeep Wrangler for sale, which is grandfathered in because we imported it in 2018 just before the new law went into effect. Email us for info: [link moderated]
Articles to help you in your expat project in Papua New Guinea