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The 2003 Ford Focus comes with a choice of either a 2.0 L 4Cylinder or a 2.3 L 4Cylinder engine, both requiring 4.5 quarts of oil along with a filter. It is recommended to use 5W-20 Synthetic oil for the best performance in all weather conditions. The numbers 5W-20 indicate that the oil's viscosity is 5 at startup, with "W" standing for winter, and 20 being the viscosity at operating speeds. The torque specification for the drain plug is 17 ft/lbs for the 2.0 L engine and 21 ft/lbs for the 2.3 L engine. To maintain optimum performance, it is advisable to change the oil and filter every 5,000 miles. The cost of oil ranges from $8 to $13 per quart, totaling $36 to $59 for the required 4.5 quarts. Performing an oil change typically takes between 5 to 15 minutes.
You will need 4 quarts of 5W-20 oil for the 2-liter engine. If you have the 2.3 engine, you will need 4.5 quarts of 5W-20 oil when doing an oil change. Don't forget to also replace the filter.