[ChrisNich117]

Originally Posted by JNoSol

I read countless threads, it's hit or miss. Probably how the break-in procedure was done and how the car is driven. When I had a 2012 750Li, I didn't have to add a single qt of oil while others are adding 1qt per 2k miles. I broke the car in gently and avoided engine braking. With my M5, I only topped off 1qt so far but I was doing a lot of engine braking (slowing down the vehicle in low gear, without using the brakes).

Both 2013 and 2015 burn oil, depending who you ask.

Lifting off the throttle at high RPM (engine braking) creates negative pressure in the compression chamber and cause the most oil burn. All newer engines have low friction piston rings, which is the main cause of oil burns. A small percentage of oil also escape the PCV valve, which enters the intake under high accelerations.

The M3/M4 S55 engine makes more power per liter and have no issues with burning oil. I think the S55 uses different piston rings technology and I know they have an oil catch can built-in that recycles blow-by oil. Perhaps the next gen M5 will adapt this technology.

My e92 m3, x5 4.8is, 14 x5 50i and my old 13 burned the most oil. The new x5 isn't that bad but when you drive it hard for a week the measurement shows some consumption. I also have an 08 535xi in Europe that doesn't burn much at all. I have noticed a significantly greater loss from engine braking like you mentioned. It went from 5k miles to about 3k now that I've been driving it mostly in manual mode, but the pre LCI's were terrible. I drove it like a turtle during the break in and it needed 1 quart before the odo reached 1k miles. My friend got a 14 LCI before my LCI arrived and he didn't add oil until 6000 miles after his break in service. I actually thought that having turbos would be better than NA engines as far as the oil consumption from the other cars but it's worse lol.