What is the normal amount of engine oil when the engine is cold?
2 Answers
Generally, when the engine is cold, the oil level should be between the upper and lower marks on the dipstick, which is considered the normal oil level. Below is the classification method for engine oil grades: 1. AB series: Gasoline and light-duty diesel engine oils. 2. C series: Catalyst-compatible engine oils. 3. E series: Heavy-duty diesel engine oils. Here is additional information about the functions of engine oil: 1. Reduces wear: Separates the surfaces of relatively sliding parts to minimize wear. 2. Cools the engine: Takes heat back to the oil pan and dissipates it into the air to help the radiator cool the engine. 3. Cleans contaminants: Circulates carbon deposits, sludge, and wear particles from engine parts back to the oil pan, using the flow of the oil to clean dirt generated on the working surfaces of the parts.
Checking engine oil when the car is cold is crucial. I usually find a flat surface to park the car in the morning before driving, wait for the engine to cool down, and then start the inspection. Pull out the dipstick, wipe it clean, reinsert it, and then pull it out again to check the oil level between the MIN and MAX marks on the dipstick—ideally, it should be in the middle. This is because oil expands when hot and contracts when cold, so the reading is accurate only when it's cooled down. If the oil level is too low, insufficient lubrication can lead to engine wear; if it's too high, it may increase pressure or cause leaks. It's recommended to check once a month, especially before long trips. If the oil level is low, I add a bit of the appropriate oil, but in small increments to avoid overfilling. In short, maintaining the oil within this range ensures smooth operation and a long engine life.
