A better indicator of oil-change frequency would be looking at the underside of the oil filler cap, checking for sludge or even condensation of water vapor, which could indicate a combustion leak (leaky head gasket or cracked head). If the oil appears thick and milky, it is usually an indication that coolant is somehow getting [...]

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Not every shop has this particular test device (although almost all radiator shops do), but if the balance test and compression test indicated a problem, this test might be called for. A device samples coolant from the radiator with the engine running at high idle, and a test liquid changes color if there are combustion [...]

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