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Old 05-07-2015, 10:47 PM   #1
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Default Lower unit oil

Do I need to use Yamaha lower drive oil in my 90 four stoke or can I use automotive 90 weight ? Thanks
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Old 05-07-2015, 10:50 PM   #2
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marine oil has corrosion inhibtors, automotive oils don't....
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Old 05-07-2015, 11:59 PM   #3
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Yes, you can use it. Change once a year, on avg use.
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Old 05-08-2015, 12:20 AM   #4
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Quote:
Originally Posted by The Maintenance Shoppe View Post
marine oil has corrosion inhibtors, automotive oils don't....
Yep, get water in automotive oil and the oil protection properties go downhill quickly. Marine lower unit oils will still provide some lubrication with some water intrusion. You don't have to use the yamaha brand per se. But stick with a lower unit oil meant for marine applications.
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Old 05-08-2015, 01:03 AM   #5
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I would stick with the marine grade. As some others have stated it has a bit more corrosion protection should some water get in as well as better anti-foaming agents.
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Old 05-09-2015, 12:46 AM   #6
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Invest in the pump that screws onto the quart oil jug, best money ever spent
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Old 05-09-2015, 01:38 AM   #7
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Marine oil.
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