How much oil should be added to the BMW N55 engine?
2 Answers
BMW N55 engine requires 7L of oil. Oil consumption: BMW engines generally have relatively high oil consumption, so the 6-cylinder engines in their vehicles are designed to use 7 liters of oil. When adding oil, it's crucial not to go below the middle mark on the dipstick. The optimal oil level is between the upper and lower marks on the dipstick. The oil quantity must be maintained within the specified range, as both excessive and insufficient oil can affect the vehicle's normal operation. Overfilling with oil will directly impact fuel consumption, as the crankshaft may come into contact with the oil at its lowest point, creating resistance that affects vehicle performance. Oil change procedure: When changing the vehicle's oil, the oil filter must be replaced simultaneously because each new oil filter comes completely dry without any oil. After completing the oil refill and running the engine briefly, it's essential to let the vehicle sit for 3 minutes before checking. This allows time for the oil to gradually flow into the new oil filter's sump, enabling more accurate assessment of the oil level.
Last time working on the BMW N55 in the workshop, the standard oil capacity for this engine is 4.25 liters, but extra care is needed during actual operation. Remember to completely drain the old oil first, replace the oil filter, and then refill. I usually pour in 4 liters initially, start the engine and let it run for two to three minutes to circulate the oil, then turn it off and wait five minutes before checking the electronic dipstick. If it shows below the maximum level, top it up half a liter at a time—never rush it. I once saw someone pour in 5 liters directly, which resulted in oil submerging the crankshaft, blue smoke, and an emission fault code. For oil specifications, stick to BMW Longlife-01 certified 5W-30 for the safest bet.
