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Leakdown and compression tests only show how well the chambers are sealing (rings, head gasket, valve seats).
The seal/guides are outside that.
You'll probably find obvious spark plug fouling in the cylinder coresponding to that guide, but the oil could be also be being drawn in by sticking or worn piston rings.
To find the bad cylinder, shine an infrared thermometer on each exhaust header- the cold one is not burning right.
Or, a balance test could find the suspect cylinder- Pull each plug wire until one does not cause a rpm drop.
Oil can also be drawn into the engine through the brake master cylinder(to all cylinders) or lost through front pulley seals, oil pan, or rear transmission seals. Look carefully on the outside first before concluding it's going into the engine.
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