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What oil do i use in the lower unit of a 1989 90 hp mercury outbord

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Go to a marine store and get lower unit gear lube. it comes in a squeeze tune and just remove the plug and squirt it in . both screws need to be out tho upper one lets air out as you push new in lower .the put upper back in first keeping oil in till you put in lower plug

Posted on May 01, 2010

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