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In 2015, the VW Passat TSI requires SAE 5W-40 oil, and Volkswagen suggests using only full synthetic oil in the engine. Synthetic oil provides increased protection for the moving parts in your car compared to conventional oil, which is petroleum-based. Synthetic oil, created in a lab, is engineered to safeguard your engine, meaning it needs changing less often - typically every 7,500 miles compared to 3,000 to 5,000 miles for conventional oil. It's wise to monitor your oil level and cleanliness by checking it each time you refill your gas tank.
The recommended oil type for the 2015 VW Passat TSI is either SAE 5W-30 or 5W-40.
How about this: synthetic motor oil with a viscosity grade of 5w40
how about this: "Full synthetic motor oil with a 5w-40 viscosity rating.
How about this: "Synthetic motor oil with a viscosity grade of 10W-40.