I did find a notice from Volvo that recommended not using ATF in the cyl's, they flushed mine and replaced with oil. The notice said that some of the O rings and seals are made to react (swell) with motor oil and have a tendency not to swell with ATF. So far (cross fingers) it has not leaked.
We'll see. I'm putting it in the water Friday or Sat and trying it.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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