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What oil in 898 outdrive

Hi I have a couple of older bo

Hi I have a couple of older boats with the Mercruiser 898 outdrives. The outdrives have been rebuilt and run well. What I need to find out is what trim fluid do I run in the trim pump? I have been told to use 20w oil or transmission fluid. Mercrusier does not make the trim oil for these old pumps anymore according to 4 Mercruiser dealers. Help please
 
"Use want was in the pump and

"Use want was in the pump and tubes, Changing it is a pain...............
They both work well. If it is red Trans fluid(dextron) if any other color... oil. if you can't tell smell it... oil and tran smell different."
 
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