In Australia, you can get Penrite Enviro+ DL-1 in an increasing number of common auto stores, or OEM Mazda Extra Diesel Oil DL-1. I believe Toyota and Mitsubishi both sell retail packs of DL-1 oil.
The manual says you can use JASO DL-1 or ACEA C1. The latter is mainly for European markets where they go by ACEA ratings. ACEA C1 is actually lower in SAPS than the JASO DL-1 standard.
ACEA C1 can be bought in Australia as Liqui-Moly Top Tec 4500 C1 in retail stores. Fuchs Titan GT1 Pro C1 is both JASO DL-1 and ACEA C1 compatible, but extremely difficult to find and Fuchs support arent really helpful when i enquired. Castrol EDGE Professional C1 (Was SLX Professional Powerflow C1) is available, but as a trade only product in 20L drums from specialist Castrol dealers.
I believe Mobil and Shell produce a suitable oil, but its only available in Europe.
It's not really the engine that demands this oil.. it's the DPF that requires extremely low ash oil - lower than C2 which is used commonly in European diesels like modern TDIs. Soot can be incinerated during regeneration. Ash cant. Ash accumulation results in reduced DPF capacity, resulting in more frequent (shorter intervals) regenerations and higher fuel consumption as a result.
