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Old 06-08-2016, 05:02 PM
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Default Trim pump fluid?
Replacing trim pumps and I have had several suggestions on what to fill them with! ATF, power steering fluid, hydraulic fluid. Which is best? Thanks
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Old 06-08-2016, 05:38 PM
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It's supposed to be oil but I have a couple with ATF in them.
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Old 06-08-2016, 07:27 PM
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Old 06-08-2016, 07:37 PM
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Pretty sure Mercury says 10-30w oil
Last edited by BenPerfected; 06-08-2016 at 07:45 PM. Reason: Correction
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Old 06-08-2016, 08:13 PM
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We just had a thread on this a couple weeks ago. Pretty much boils down to your choice. Mercruiser says Mercruiser power steering and trim fluid, 10w30 or 10w40.

Others successfully use atf or power steering fluid which I use. Climate etc can play a part also. Up here in northern Michigan the lighter the better for quicker response.
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Old 06-08-2016, 08:16 PM
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With all the comments on other thread I assure you you'll be fine with any of the above. Just don't mix
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Old 06-08-2016, 08:19 PM
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Originally Posted by getrdunn
With all the comments on other thread I assure you you'll be fine with any of the above. Just don't mix
What happens when you mix them?
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Old 06-08-2016, 09:35 PM
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My pump has a sticker on it that says 20W-20 oil. Never could find it so I have 5w-20 in it. Like getrdunn said, most anything will work, just don't mix.
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