1. In a world where tool-shaped objects are sold by companies like Hazzard Fraught, "Low compression" can be an inaccurate gauge as easily as a problem with the engine. VERIFY the compression tester before condemning the engine.
2. "Oil in the cylinders" during a compression test never made sense to me; how is the oil supposed to climb the cylinder wall on the intake-manifold side to seal the rings on the "uphill" side of the cylinder? I quit adding oil to cylinders decades ago.
3. A leakdown test is excellent for finding low-power, non-sealing cylinders. A cylinder can seal and have compression but still burn oil. This is especially true if the oil is coming down the valve guide
or sucked-through the PCV. There's a pretty fair chance that neither of those issues will show up in a leakdown test.
4. Any chance this engine has aftermarket valve covers? Aftermarket covers often have crappy oil separators. Any oil in the PCV hoses?
2. "Oil in the cylinders" during a compression test never made sense to me; how is the oil supposed to climb the cylinder wall on the intake-manifold side to seal the rings on the "uphill" side of the cylinder? I quit adding oil to cylinders decades ago.
3. A leakdown test is excellent for finding low-power, non-sealing cylinders. A cylinder can seal and have compression but still burn oil. This is especially true if the oil is coming down the valve guide
or sucked-through the PCV. There's a pretty fair chance that neither of those issues will show up in a leakdown test.
4. Any chance this engine has aftermarket valve covers? Aftermarket covers often have crappy oil separators. Any oil in the PCV hoses?