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Old 07-04-2019, 07:35 PM   #1
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92 Sun Voyager 5.9 oil differential oil

I know it takes 75-90 gear oil. Is there a special oil requirement? And can synthetic be mixed is there a benefit ?
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Old 07-04-2019, 07:46 PM   #2
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Originally Posted by Washington T View Post
I know it takes 75-90 gear oil. Is there a special oil requirement? And can synthetic be mixed is there a benefit ?
You can mix synthetic with conventional oil but the benefits of synthetic will be diluted by the conventional oil.

Doing a complete change involves pulling both wheel hubs, since they are supplied by the center differential and hold a quart of oil or so.
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Old 07-05-2019, 07:35 AM   #3
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Synthetic can be mixed with regular oil , but I wouldn't bother unless it is called for by the manufacturer . Synthetic will sometimes leak at the seals where as conventional oil will not.
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Old 07-09-2019, 01:46 PM   #4
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Thanks for the replies. Have done ton's of vehicles but not a Motorhome still in learning curve. Added synthetic. I am a mobile 1 fan for years.
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