oil consumption on 1989 300 se
I have an 89 300 se with 170k miles. When I ran 10w30 oil, and take it on a long trip, within 1.5 hours, my oil light would come on and the dipstick would show low oil. I changed to 10w40 and the problem got a little better, but still consumes about a half quart every 3-4 weeks. I notice any smoke from the exhaust when the car is driven. I do not notice any leaks in the garage. Can anyone tell me where the oil may be going? I know it is normal for an older car with that many miles to use a little oil, but is this normal for mercedes? This is the first I have owned.