What does the engine oil grade 20W-50 mean?
1 Answers
The engine oil grade 20W-50 represents the oil viscosity, where W stands for winter use, the number 20 before W indicates low-temperature viscosity, and 50 refers to the viscosity at 100°C. Below are the relevant instructions for changing engine oil: Engine oil change instructions: Start the engine and bring it to operating temperature; drain the oil by locating the oil drain plug underneath the vehicle, unscrew it to allow the oil to flow out, and observe the oil color—if it appears black, it should be replaced promptly; unscrew the oil filter, as the oil flow slows down, this is when you can remove the oil filter for secondary draining. Engine oil change method: After all the oil has drained completely, replace the oil filter, install the new filter using a filter wrench, tighten it, then secure the drain plug, and lower the vehicle; pour an appropriate amount of oil into the filler port; start the engine and listen for any unusual noises, then pull out the dipstick to check if the oil has overflowed or reached the lower limit.