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Type of oil for 280T trim pump?

M

mike77cj

Regular Contributor
I have always filled the trim pump for my 280T with Type F tranny fluid. The pistions have always dropped over night and under load as well. I figured this was due to worn o-rings on the piston. BUT this weekend I noticed the exact same pump on my buddy's Merc setup and the sticker reads: "SAE 10-30 or 10-40 ONLY". I am wondering if tranny fluid is not viscous enough and 'slips' by the o-rings under load. The relative viscosities of ATF to motor oil (at 40C) is 39/91, so there is quite a difference.

What do you guys use?

Thanks.
 
Cool, thanks Gary. I believe my assumptions are correct, so I'm interested in seeing what happens.

Nice to hear from you, hope all is well.
 
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