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The 2006 Volkswagen Jetta TDI can use high-quality motor oil with 5w-40 or 5w-30 viscosity, which is typically full synthetic. While semi-synthetic and conventional oils are also suitable options, fully synthetic oils provide additional protection, efficiency, and longevity to the engine. Semi-synthetic and conventional oils are effective but may not offer the same level of benefits. For full synthetic oil, it is recommended to change it every 7,500 to 10,000 miles, while conventional oil should be changed more frequently at 3,500 to 5,000 miles. Semi-synthetic oil changes can be done every 7,000 to 8,000 miles.
The specified oil for the 2006 VW Jetta TDI is SAE 5W-30 synthetic oil.