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Purchased a boat w/ twin 2008 suzuki 300's and the port lower unit was replaced when we purchased it. This was our first service.



Two questions:



1. the lower unit oil in the port motor was a dark motor color, but not milky and had no metal. the starboard side was the usual color of fresh lower unit oil. does the color of the port lower unit mean there is a problem???





2. little brother filled the lower units up by the top vent hole instead of from the drain. Should I drain the lower units and refill from the drain or just open the vent and make sure the oil level is right???





Thanks for the help.
 

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If this is the first oil change on the port side, the darker color is due to breaking it in. With that said though, usually counter rotation units get darker oil due to more moving components. As far as the oil level goes, I personally would start filling from the bottom and verify that way that they are full. You do not have to drain them again, just pull both plugs and fill the normal way.
 

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Double D is right on. The one other thing to do when fillilg in your case if you want to make sure it's full is to remove the bottom plug then hook up the filler to the bottom plug. Then remove the top plug and fill till it runs out, replace the top plug and then replace the bottom plug. This way a vaccumn is created and fluid drain is minimal compared to removing both plugs at once.
 
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