best oil for 100 series landcruiser diesel

For a 100 Series LandCruiser diesel (1HZ or 1HD‑FTE), a diesel-rated 15W‑40 suits most Aussie conditions, meeting API CI‑4/CK‑4 (or ACEA E7) for proper protection.

If you’re doing cold alpine starts or towing through summer heat, a full-synthetic 5W‑40 keeps it smooth without turning the sump into porridge.

Change it every 5,000–10,000 km depending on dust, towing and idling, and don’t skimp on the filter—these engines aren’t fussy, just fond of clean oil.

Skip low‑SAPS DPF oils; the 100 Series doesn’t use a DPF and is happier on the classic diesel brew.

Consult official documentation for exact figures.