What a great forum. I've learned so much and hope to learn why my '03 E320 Wagon purchased used with 80,000 miles keeps telling me I'm low on oil only after highway driving.

I took it to Brumos in Jacksonville, FL. Paid $400 for an oil test. They told me to come back in 1,000 miles. I did. No leaking. But I had only driven the car locally.

A week or two later I drive five hours on the highway. And I'm low on oil again.

I this a common occurence? If so, that's okay. I love the car and besides...I owned a 67 MGB and am accustomed to carrying quarts of oil in the trunk.