Vehicle Questions and Answers
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For your 2008 Ford Focus, it is recommended to use 4.5 quarts of SAE 5W-20 oil. Whether you choose conventional or synthetic oil is up to you, but synthetic is likely better for long-term engine health. You can easily find a 5-quart bottle of most motor oils at your local auto goods store or Walmart for around $25, depending on the brand. You'll also need a compatible filter for about $12, which should be changed at the same time as the oil. This maintenance is relatively affordable as long as you already have the necessary tools on hand.
Here's a paraphrased and unique version: "The viscosity grade recommended for optimal engine performance in many American vehicles is 5w-20.
The recommended engine oil for a 2008 Ford Focus is 5w-20.