A factory service manual is written for tech's.
It is assumed tech's know about RTV usage, how to take things apart etc.
Thats why a factory manual gets right to the meat and potatoes.

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79 240D my current toy
42 years a Diesel addict

240D sold
250SE sold
220D sold
280C sold
280S sold
300D (2) sold
300CD sold
300DT sold
300SD sold
380SL sold