What oil do you use in a vauxhall astra 1.7tdi?

For a Vauxhall Astra 1.7 TDI, it is recommended to use a high-quality engine oil that meets the specifications of ACEA C3 or API SN. Typically, a 5W-30 fully synthetic oil is suitable for this model, as it provides good performance in various temperatures and conditions. Always consult the owner's manual for specific oil requirements and any manufacturer recommendations.