The Kioti Australia warranty exclusions include "Damage to fuel injection systems caused by the use of BIO or contaminated fuels". My new RX8030 does not have a DPF, so is not a Tier 4 engine (as I understand)
There are four grades of diesel here - diesel, diesel premium, B5 and B20, the last two indicating the percentage of bio products in the fuel. Yet, the Australian regulations state "Up to 5% biodiesel can be included in any diesel sold in Australia without additional labelling."
Can of worms, eh!