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Volvo suggests using fully synthetic oil for the best performance of the 2008 Volvo S40, specifically sae 0w-20 synthetic oil. This model has a 2.4L engine with a maximum oil capacity of 4.4 quarts. While fully synthetic oil is preferred, semi-synthetic options are also acceptable. Fully synthetic oils provide superior protection, efficiency, and performance compared to semi-synthetic oils, leading to a longer lifespan and better performance. Volvo recommends changing both the oil and oil filter every 3,000 to 5,000 miles when using conventional oil. For synthetic oils, whether fully synthetic or semi-synthetic, Volvo suggests changing the oil and filter every 7,500 to 10,000 miles for optimal maintenance.
The manual for the 2008 Volvo S40 recommends using either 5W-40 or 0W-40 oil thickness.