Audi say:- 2. What is an acceptable level of oil consumption? Consumption of up to 0.5 litres per 1000km (approx. 620 miles) is specified as acceptable by Audi and is widely acknowledged as normal across the industry This surprised the heck out of me. I would never consider that normal, so I wondered what BMW thought... From here : http://www.bmw.com.cn/cn/en/owners/warranties/warranty_others.html For BMW spark-ignition and diesel engines, the maximum permissible engine oil consumption is 0.7 l/1000 km. Because of their increased power output and torque, M engines have a maximum permissible oil consumption of 1.5 l/1000 km. So, amazingly, allowed BMW oil consumption is up to three times higher! (However, I ran an E28 M5 for about 100,000 miles, and it hardly used any oil. It did eat a timing chain and a lot of valves, though) I'm curious what limits other manufacturers have...??