Should the Focus use 5W30 or 5W40 engine oil?
1 Answers
The Focus originally uses semi-synthetic engine oil, model 5W-30, with a replacement capacity of 4L and a replacement cycle of 5000km. If you want to change the engine oil during later maintenance, you can choose brands such as Shell or Castrol. The viscosity of engine oil changes with temperature, so special attention should be paid to its performance under low and high temperatures. For example, in 5W-30, the first number indicates low-temperature fluidity, where 5W represents the ability to withstand temperatures as low as -30°C. The smaller this number, the better the low-temperature fluidity, making cold starts smoother. The latter number represents the kinematic viscosity of the oil at 100°C. A higher value means the oil can maintain its viscosity index better at high temperatures, which can also be understood as better lubrication performance under high-temperature conditions. The method for changing the Focus's engine oil is as follows: Wait for the engine temperature to drop, allowing the oil to flow back into the oil pan; Use a wrench to loosen the oil drain plug, and use an oil pan to catch the old oil until no more oil flows out. Start the engine for about 30 seconds to allow the oil in the main oil passage to drain; Use a special wrench to remove the oil filter; apply oil to the seal of the new oil filter and tighten it clockwise by hand; Add the new engine oil through the oil filler cap on the engine valve cover, typically filling about three-quarters of a 4L bottle; Start the engine and let it run for 5 minutes, checking for oil leaks around the drain plug and oil filter. If leaks are found, repairs should be made; After stopping the engine, pull out the oil dipstick and check that the engine oil level is within the standard range.
