What kind of engine oil is suitable for BMW 740Li?

[ElleLee]

You can use Mobil 1 or Castrol Edge fully synthetic engine oil. Introduction to engine oil: Engine oil, also known as engine lubricant, serves multiple functions such as lubrication and wear reduction, auxiliary cooling, sealing and leakage prevention, rust and corrosion protection, as well as shock absorption. It is often referred to as the 'blood' of a car. Engine oil consists of two main components: base oil and additives. The base oil is the primary constituent of lubricants, determining their fundamental properties, while additives compensate for and enhance the shortcomings of the base oil, imparting new characteristics, making them an essential part of lubricants. Characteristics of engine oil: The engine is the heart of a car, containing numerous metal surfaces that move against each other at high speeds under harsh conditions, with operating temperatures ranging from 400 to 600 degrees Celsius. Advanced technology can convert natural gas into crystal-clean fully synthetic base oil, which is then combined with unique power cleaning technology to create lubricants with superior cleaning and protective performance. Only qualified lubricants can reduce engine component wear and extend service life under such severe operating conditions.

[JoyMarie]

My BMW 740Li has been running for five years, and I've always used 0W-30 full synthetic oil for maintenance. The BMW inline-six engine has high requirements for oil, which must carry BMW Longlife-04 certification. Last time I tried Shell's 0W-40, but the throttle response wasn't as sharp as with 0W-30, and fuel consumption increased by half a liter. Now I'm using Castrol EDGE series, changing it every 10,000 kilometers. Remember to check the certification number on the oil container—don't be fooled into using regular 5W-40, as long-term use may cause sludge buildup. In northern winters, using 0W-grade oil is safer, ensuring smoother starts well below zero. Recently, I discovered that China's Kunlun KR9 has also passed BMW certification and is 30% cheaper—I'll give it a try next time.

[DelMadelyn]

When selecting engine oil for the 740Li, first consider the model year. The newer B58 engine requires 0W-20 low-viscosity oil with LL-17FE+ certification, while the older N62 is better suited for 5W-30 with LL-04. I prefer Mobil 1 synthetic, especially for frequent highway driving, as it offers better high-temperature protection. I tried 0W-40 during summer - the engine sound became deeper, but fuel consumption was higher in city traffic jams. Always use Mann or Mahle oil filters, as aftermarket parts tend to leak. Don't exceed 8,000 km maintenance intervals, especially for frequent short trips where oil degrades faster. Modified engines require more frequent changes - my friend's ECU-tuned engine using conventional oil seized within six months.

[OEvelyn]

The BMW manual requires engine oil meeting the ACEA C3 standard, recommending three major brands: Castrol Edge, Shell Helix Ultra, or Mobil ESP. I have a 2012 740Li in my garage that has been using 5W-30 year-round, switching to 0W-30 in winter. Oil viscosity directly impacts turbocharger lifespan—lower viscosity offers quicker acceleration but weaker high-RPM protection. During the last maintenance, metal shavings were found in the oil pan, prompting an immediate switch to anti-wear additives. A friend at the tuning shop recommended Liqui Moly 4200, claiming its ceramic content is better suited for older BMWs, though it costs twice as much. During oil changes, it's advisable to also inspect the valve cover gasket, as oil leaks here are a common issue.