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Trim tilt fluid

gkm24

Regular Contributor
1991 Mercruiser drive system.

1991 Mercruiser drive system. What fluid should be in it. Just replaceing the pump and motor so want to put correct fluid in it. the fluid that is in it looks lime greenish. No water in it. Seems an odd colour. Thanks.
 
Sounds like OD oil or motor oi

Sounds like OD oil or motor oil; is it thick? Most boats built recently are using Automatic Transmission Fluid. You can use a 5W30 wt. or straight 30 wt. motor oil or power steering/trim pump oil by Merc. Any ATF or power steering oil will work.
 
Never put my finger in it to b

Never put my finger in it to be honest but I will give the 5W30 a whirl I think. Many thanks.
 
Mine has a factory looking lab

Mine has a factory looking label saying 10-30W motor oil and it looks like it is. It is a 1986 470
 
"The oil that was in it was a

"The oil that was in it was a very thin oil but green. Anyway, changed it to 10-30w now but still will not lift the leg when planing. Will only work at low speed so will have to get the rams repaired."
 
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