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Castrol EDGE Titanium FST 5W-30 C3 fuel-efficient low-viscosity synthetic engine oil suitable for year-round use in normal-charging and turbocharged petrol and light-duty diesel engines, where recommends the use of engine oils of SAE viscosity grade SAE 5W-30 and grades ACEA C3, API SN or earlier. Castrol EDGE Titanium FST 5W-30 C3 engine oil is approved by many original equipment manufacturers (OEMs). This engine oil is GM dexos2® approved by original equipment manufacturer General Motors/Opel/Vauxhall, so it replaces and is recommended instead of engine oils that comply with previous GM-LL-B-025 and GM-LL-A-025 approvals. When selecting engine oil, always refer to the vehicle owner's manual, SAE viscosity grade, engine oil quality grades and OEM requirements.