Car: GM / Holden / Opel Astra (AH)
OCI: 6 months / 8,000KM / 5,000 miles
Out: Castrol Magnatec 10W30 semi-synthetic (SN, A3/B4) + Wesfil-Cooper filter
In: Valvoline SynPower 0W40 full synthetic (SN, A3/B4, OEM's) + Valvoline synthetic blend media filter