Manual or similar for engine work on 240D

I expect I'm looking at some engine work to diagnose & fix my oil use on an 82 benz 240D. at least something less sketchy than the chilton I have right now.
Are the topic manuals at mercessource.com any good?
Thanks,
Andy
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Factory service manual are the best... printed used one can be found on ebay and sometime you can find the CD version... SOMETIME...
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yup, use manual ___________ Used Car Donation http://www.zone-car.com
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