Diesel Engine Specific Aid

What is the manufactures advertised MPG on the 240D and 300D?

Did this vary depending on the model year?

While negotiating the purchase of a 240D with WVO installed the seller said, he had just purchased a 1983 300D that got better fuel mileage per gallon. I thought this odd considering the 240D is a 4 cylinder and the 300D is 5 cylinder. Would use of the WVO system in the 240D somehow cause this to occur or is it more likely something else causing this to occur? Would the vehicle the 240D get better gas mileage if run solely on diesel fuel?

Thanks.

Just got done pulling the intake/exhaust manifold and noticed what appears to be a relatively small leak from the head gasket (see photo).
http://tinyurl.com/ygyrya2

My question is, how serious is this? As far as I know, this is the remnants of an old leak that happened 20 years ago and hasn't leaked since...no idea though. Engine has right at 200K mi. on it.

I am kind of a newbie with Diesel, can someone send me directions on replacing glow plugs, my glow plug light comes on for a second and turns off. I would like to replace all glow plugs. Thanks and Happy New Year

This is my third Merecedes, the first 2 had 200K+ at time of purchase and i ran the cars until the body was literally falling off on one and the suspension fell apart on the other. Both still had sound engines but everything else was worn out. My latest purchase has 162K miles, everything appears clean inside and out, body good shape, feels solid going down the road, etc. One problem : uses a quart of oil every 200 miles when going at interstate speeds. Considering the others engines had so many miles and still ran well i have a hard time giving up on this one.