I wonder if a $2/qt bottle of vegetable oil will be a good lube- probably 1/2 bottle per tank. Strikes me as much cheaper than motor oil, if you buy new motor oil.

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1984 300D Turbo Diesel - 211700+ mileage (now sold)
http://www.maj.com/gallery/Ned/benz/sig.jpg
In any of my posts, it is safe to assume
that I'm talking about this car.