Narrative:

Just before leveling off at FL290 I noticed a decrease in oil quantity on the right engine. Oil quantity decreased at a rate of 1 quart every 3-5 min. We referred to our cockpit operating manual which led to an eventual shutdown of the engine and a diversion. At the time a diversion was called for we were halfway between jan and mem. Mem was straight ahead and the WX was clear. We proceeded to mem and landed uneventfully. Callback conversation with reporter revealed the following information: the reporter stated the cause of the loss of oil was reported by maintenance as a clogged oil screen. The reporter said the screen was clogged with coke and the screen was replaced. The reporter stated the airplane was again dispatched with the same result of loss of oil and a clogged oil screen. The reporter said the engine was changed and then maintenance reported the engine was serviced with a brand of oil recently adopted by the carrier which was a high detergent oil. The reporter stated the high detergent cleaned out all the coke from the interior of the engine blocking the oil screen. The reporter said the oil bypassed seals and into the engine gas path. The reporter stated the engine was a JT8D-9.

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Original NASA ASRS Text

Title: A DC9-30 IN CLB AT FL290 DIVERTED DUE TO LOSS OF OIL IN THE RIGHT ENG CAUSED BY CLOGGING OF THE OIL FILTER. CAUSED BY INCOMPATIBLE OIL.

Narrative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

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.