535i: I measure the volume of the oil I drain out. I change my oil about every 8k miles. My last oil change was at 54.5k miles, and I consumed about 850ml in 8300 miles. At 16.5k miles, I'd only consumed about 400ml in 6.8k miles. At 38.2k miles, I'd consumed about 700ml in 7.7k miles.
The service manager at the dealership I use says that's typical for an N55, and that a lot of their customers get a low-oil warning light right before the scheduled 10k or 11k mile oil changes.
The BMW V8's are usually the ones with the oil consumption problems. Most, if not all of those problems are caused by the intense heat in those engines baking and drying out the valve stem seals, and by varnish (deteriorated oil) causing the piston rings to stick in the closed position (against the piston, instead of against the cylinder wall).
It's not poor engine design. It's virtually impossible to keep oil from getting past the rings. The oil is needed to lubricate the rings against the cylinder walls. The trick is to lubricate without letting oil past the rings.
Id say its better than normal. My 535i also consumes a tiny amount between changes. Id only worry if I had to top up between changes.My 535 has 37500 miles on it. What is the normal oil consumption after driving 6000 miles (easy driving). My measurements show a loss of approx. 4%. is this normal?