What oil do i use 1999 vw beetle 1.9 diesel?

For a 1999 VW Beetle 1.9 diesel, it is recommended to use a high-quality diesel engine oil that meets the specifications of VW 505.00 or 507.00. Commonly used oils include 5W-40 or 15W-40 synthetic or semi-synthetic oils, depending on the climate and driving conditions. Always check the owner's manual for specific recommendations and requirements.