You can but all liquimoly products from speed in Tauranga 0508 277333 they are the agent
As for DPF Cloggng, ensure car has right oil, number one cause of issues is wrong oil
I travel through Wanganui about once a month on trip from New Plymouth to Palmerston, if your keen to get it all done let me know and I can carry one with me on next trip
Www.eurosurgeon.co.nz