As I understand it, a compression test will give inaccurate numbers if the valves aren't adjusted first. So I would make sure this is/has been done first. If I'm wrong, disregard this statement.

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1985 300D
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1970 Jaguar E-Type OTS
2002 Dodge Intrepid (Traded In)
2011 Ford Crown Victoria

Correct. Valves first.

Leakdown will tell you more than compression test- rings, head gasket or valves as source of leakage.

If compression on a low cylinder goes up after you squirt oil into it, leakage is around the rings.

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