Bronxteck, correct! norinco3264, fellow Ohioan, different scenario, "sludge" is caused by unburned fuel mixing with oil, yet you found that under the oil cap. "Milky substance" is caused by water and oil mixing together and if found on the level indicator aka dipstick, the engine won't last long! Ismitty41, you dug up a 6+year old thread! (OP no longer posting)Start a new thread for further advice!