Our very nice 15 year old E-350 sedan with 150,000 miles began consuming oil. I advised Nathan at International Auto Specialists on Lafayette Ave of the problem. He recommended adding an engine cleaning product to the oil to clean out any particles that may be causing the oil loss. This was done and then we completed an 800 mile trip we had scheduled. Upon return, the oil was checked and the consumption had not gone down! This sort of advise and maintenance has been our experience at International Auto Specialists for over ten years for our two Mercedes. We really value their knowledge and service, and will continue having them take care of our vehicles.