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Corvette
C7 Forum
Advice on C7 differential fluid change
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<blockquote data-quote="Afterimage" data-source="post: 284237" data-attributes="member: 7676"><p>That gunk will always be there whether you change it every year or every 5 years or longer you'll just have more of it on the factory mag plug if you wait longer to change it.</p><p></p><p>People change it often especially when you get the car new is due to the fact the factory for the most part didn't fill the rear diff with the right amount of fluid at the factory and most of that "gunk" is from break in of the rear end gears and stuff in the diff. Some people with "new" C7 purchased have measured diff fluid drained out as only around 2.5L or a bit more but below the 3L that usually drains out. The "new" fluid that is drained out from an initial drain and fill is also very black and yucky looking even just after putting 1000kms on the car.</p><p></p><p>My car was this case. I drained it out after putting 1k on the car back in 2020 and only 2.5L came out and very dark looking and added 3L in before it started coming out the fill hole. The next year drained all 3L out the fluid looked better but still not the new gold looking oil. Spring 2022 drained it out again much better looking fluid and as stated earlier will do 1 more next year then I should be good to go a few years before changing it.</p><p></p><p>If you track the car manual says to drain and refill after each event.</p><p></p><p>Did you see this post I did last year sometime???</p><p>[URL unfurl="true"]https://canadiancorvetteforums.com/threads/when-you-change-your-rear-axle-fluid.52813/[/URL]</p></blockquote><p></p>
[QUOTE="Afterimage, post: 284237, member: 7676"] That gunk will always be there whether you change it every year or every 5 years or longer you'll just have more of it on the factory mag plug if you wait longer to change it. People change it often especially when you get the car new is due to the fact the factory for the most part didn't fill the rear diff with the right amount of fluid at the factory and most of that "gunk" is from break in of the rear end gears and stuff in the diff. Some people with "new" C7 purchased have measured diff fluid drained out as only around 2.5L or a bit more but below the 3L that usually drains out. The "new" fluid that is drained out from an initial drain and fill is also very black and yucky looking even just after putting 1000kms on the car. My car was this case. I drained it out after putting 1k on the car back in 2020 and only 2.5L came out and very dark looking and added 3L in before it started coming out the fill hole. The next year drained all 3L out the fluid looked better but still not the new gold looking oil. Spring 2022 drained it out again much better looking fluid and as stated earlier will do 1 more next year then I should be good to go a few years before changing it. If you track the car manual says to drain and refill after each event. Did you see this post I did last year sometime??? [URL unfurl="true"]https://canadiancorvetteforums.com/threads/when-you-change-your-rear-axle-fluid.52813/[/URL] [/QUOTE]
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Corvette
C7 Forum
Advice on C7 differential fluid change
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