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Using leftover diff fluid

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Old Apr 11, 2013 | 10:04 AM
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Default Using leftover diff fluid
I have a half qt of the newer diff fluid and need to do a changeout today. Is it okay to use fluid that was opened a year ago?

thanks!

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Old Apr 11, 2013 | 10:09 AM
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I would
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Old Apr 11, 2013 | 10:21 AM
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As long as the part # is the same.They keep changing the part #.
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Old Apr 11, 2013 | 10:59 AM
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Keep the lid on the container and you will be fine.

Contamination is the only thing I would worry about.
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Old Apr 11, 2013 | 11:25 AM
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I don't know but for a few dollars you can be sure by buying new......why take the chance?
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Old Apr 11, 2013 | 11:30 AM
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I use leftovers all the time and all of my OA results have not suggested it as a problem, it is not hydroscopic like brake fluid and if not in use would have no reason to be contaminated by condensation, etc.
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Old Apr 11, 2013 | 01:18 PM
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Id like to top off my fluid with the remaining factory stuff, then if I find it necessary, do a full change this weekend.

Anyone try the premixed lucas or M1 diff fluid in the c6? My chevy dealership is a ways away.

thanks for the replies!

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Old Apr 11, 2013 | 01:30 PM
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I just did a break-in change for my differential and transmission and usually switch everything over to Amsoil but they did not have a recommended fluid for the differential so I stuck with the Dexron LS Gear Oil- ordered over the web and delivered in a few days. I know some say the Mobil1 LS is the same but have read otherwise:
http://www.mobiloil.com/USA-English/...Corvettes.aspx
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Old Apr 13, 2013 | 08:14 AM
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Originally Posted by wrh3
I just did a break-in change for my differential and transmission and usually switch everything over to Amsoil but they did not have a recommended fluid for the differential so I stuck with the Dexron LS Gear Oil- ordered over the web and delivered in a few days. I know some say the Mobil1 LS is the same but have read otherwise:
http://www.mobiloil.com/USA-English/...Corvettes.aspx
Many C6 owners using the same Severe Gear 75w90 AMSOIL recommends for the C5 (and I use at the track) with a few extra ounces of friction modifier to match the high levels of friction modifier needed for the C6 diff:
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (Product Code SVGQT)
AMSOIL Slip-Lock Differential Additive (Product Code ADATB)

For the OP, I'd use the leftover. Really no difference it sitting in a bottle for a year than in someones diff for a year. The diff has a vent plug on it so it is not a sealed unit.
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