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Old 11-21-2017, 11:55 AM   #2
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

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Well, since the gauge showed decent values on the other cylinders, it is likely working.
Yes, with "0" compression on a cylinder, you would expect to see something wrong once it was apart.
Could be as simple as a dropped valve guide that can hang a valve open at times, thus no compression. You should be able to look in the valve ports and see a dropped guide.

Before pulling the engine, doing a leakdown would have been best, then it would tell you if it was valves or ring/piston related.

What was the room temp when you did the oil test?
What weight oil did you use?
If a heavy oil in a cool room you may not get much leakage, but using kerosene flows pretty good in any temp.
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