Vehicle Questions and Answers
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For a 2008 Ford Focus, it's best to use SAE 5w-20 motor oil. The original oil that comes in the car is a blend of synthetic oil, but you don't have to use synthetic if you don't want to. However, it can have some advantages. It's recommended to change the oil and the filter every 3,500 to 5,000 miles if you're using conventional oil, or every 7,500 to 10,000 miles if you're using full synthetic. Although synthetic oil is more expensive than conventional options, it offers better protection for your engine. This means your car will be better safeguarded and potentially have a longer lifespan, costing you only around $65 more per year as an average driver.
In order to maintain the warranty for your 2008 Ford Focus engine, it's best to stick with Motorcraft SAE 5W-20 oil or another type that matches Ford's WSS-M2C930-A specification.