If you're testing on a cylinder you're sure the valves are closed on, and you've got some oil in there - and you're only getting 30/40/50 psi then you're certainly leaking somewhere. at 60 you're starting to come into the "ok" range.
Somebody here mentioned that you need to let air IN to the cylinder in order for it to give you the full reading - that is true.
But if you're in doubt at least get it to it's max compression level, hold it there and watch to see how long it takes for the compression to drop.
If it stays steady for a long time, you may have less of a problem than you think.
If it does go down steadily - I agree with the other person to check the head gasket first. In doing so you can get a much better feel for the situation looking at the valves and the cylinder walls.
30 - 60 is a fairly big range. Does that mean one is at 30 and another at 60? Just curious.
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