2003 vy commodore engine oil

For a 2003 VY Commodore, the 3.8‑litre V6 typically runs 10W‑30 and takes about ~4.1 L including filter. The 5.7‑litre LS1 V8 is comfortable on 5W‑30 or 10W‑30 with roughly ~5.5–6.0 L including filter. In hotter Aussie conditions or on higher‑kilometre engines, a quality 10W‑40 can be sensible. Always fit a decent filter, fill cautiously, then check the dipstick after a minute’s idle—aim for the mark, not hero status. Change it warm so the old sludge actually exits the building. Consult official documentation for exact figures.