Oil comsumption on 300E
In my experience, I've found that my '89 300E with 167,000 miles to varying degrees. After an oil change, it takes about 1250 miles before it consumes 1 qt. of oil. Then it's about 1000 miles 'til it needs another quart, and stays static until I change it around 3750 miles (1/2 the MBX recommended oil change interval).
In my wifes (just sold to our neice) former 1992 190E 2.3, it drank even more oil as it got closer to the 3750 mark.
I just bought a 1993 300CE-convertible and I haven't put enough miles on it to change the oil yet. I'm interested to see how it behaves (M104 engine instead of the M103).
Scotts Valley, CA.
1993 300 CE Cabriolet (A124) 131K miles
1997 C-280 133K miles
2000 BMW R1100RT 69K miles
1989 300 E 216K miles (sold)