Newbie question.... someone asked me this and I didn't know the answer.
What is a Leak Down Test?... I know there is one for the cooling system and that vacuum sytems can leak, but what is a leak down test for the engine and how do I do it? I am about to do my 1st valve adjustment and compression check this week and would like to know if it is something I can do at the same time.

My main symptom in my 82 300D is large blow by and oil consumption... 500 miles - 1qt. This has gone down since I replaced small seal under air filter housing, but still is high.

Starts well when cold, 28mpg, 200K+ miles. No idea as to injector condition, timing chain condition, etc.

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Mr Goodfahrt (pronounced FAIRT... means "good trip" in German)

1982 300D Turbo Pastel Gray (off-white) 200k+(?)
newbie but willing