Ok here is my contribution to Unsolved MBZ Mysteries: For years and years my 300td turbo burned about 1 qt every 1000 miles. Despite wringing of hands and frequent (every 2000 oil changes delo 400) service . All this time the hydro pneumatic suspension in the rear (accumulators and leveling valve) were shot and the fluid was like tar. The rear of the wagon was low and dragged coming up the driveway. My teeth knocked and head hit the headliner on bumps. No tech ever explained this to me. Then I finally became enlightened, logged on to this website, understood and fixed the suspension and cleaned the hydro fluid system. The car rides like a limo ...back end nice and high ..and I have not burned a drop of oil in 2000 miles! Also the transmission started shifting smoothly like it never has. This is after countless techs told me I had an unfixable blow-by problem and I shoulkd dump the car. Twilight Zone or MBZ magic? Now that I know the rings and valves aren't bad I am proceeding to tune the turbo and ALDA and discovering the car I had for years that I did not know I had. I was only able to do this because of the info on this site. The techs in my area have no idea how to fix esoteric old diesel maladies...I don't blame them... there is no money in knowing all this weird difficult old stuff for cars that have almost no market value