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Advice on Diff fluid

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Old Aug 1, 2022 | 12:28 PM
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Default Advice on Diff fluid

Hello everyone
I am going to change the differential fluid on my 2016 Z51.
On my previous Corvettes I used to use Castrol Syntrac 75W90 100% synthetic, but I just talked to the Castrol dealer and they say they haven't had it for a few months now and they don't know when they're going to bring it back.
There are several brands here that have the limited slip additive, but the only two 100% synthetic products that I find, are Valvoline Synpower 75W90 and Motul Gear LS 75W90.
Has anyone used any of them?
What would be your preference?
Thanks!!
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Old Aug 1, 2022 | 12:43 PM
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GM LS Gear Oil 75W-90, part number 10-4034 / 88862624, which I believe is 100% synthetic.
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Old Aug 1, 2022 | 01:05 PM
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Originally Posted by ersatz928
GM LS Gear Oil 75W-90, part number 10-4034 / 88862624, which I believe is 100% synthetic.
That fluid is not available here, I don´t live in US
I must choose between the mentioned
Thanks anyway!!
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Old Aug 1, 2022 | 06:45 PM
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The Mobile 1 Synthetic Gear Oil 75W-90 meets specs. I purchased at local auto parts store. In my town it was OReilly.




If the Motul Gear LS 75W90 includes limited slip, it should meet specs
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Old Aug 2, 2022 | 07:16 AM
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I dont think you can go wrong with either, as long as correct weight and has the limited slip friction modifier.. I would go with cheapest since usually its not cheap anyway.
Just buy enough to fill it up to the top.
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Old Aug 2, 2022 | 09:31 AM
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Pifo, can you order it online and have it delivered? I've done that with a few other fluids...but I do live in the US. I don't know what the extra cost would be to your location in Uruguay.
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Old Aug 2, 2022 | 10:30 AM
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Originally Posted by Jaykoh-Z51
Pifo, can you order it online and have it delivered? I've done that with a few other fluids...but I do live in the US. I don't know what the extra cost would be to your location in Uruguay.
Thanks for the advice Jaykoh, but bringing lubricants to the country is very complicated if not impossible, I have to carry out countless procedures that end up being very expensive, in addition to the time it takes.
The regulation in Uruguay says that as a person, I can bring anything from overseas; up to $200 per shipment (max 6 per year), I do not pay taxes and for more than that amount, an extra expense of 60% is paid. Also,I can bring up to $1,000 with me if I return from a trip, and as I travell twice a year to the US, is not a problem to get parts for my Corvette. But that same regulation prohibits me from bringing lubricants, fuel, tires, medications, cosmetics and some other products.
Best regards!!
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Old Aug 2, 2022 | 02:52 PM
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Essentially, the only thing that really matters is the Limited Slip Modifier. Otherwise, it's which bottle you prefer.
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Old Aug 2, 2022 | 05:11 PM
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I changed the diff fluid in my 2014 with Z51. I used the recommended AC Delco fluid. No problems.
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Old Aug 2, 2022 | 06:10 PM
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Originally Posted by Avanti
Essentially, the only thing that really matters is the Limited Slip Modifier. Otherwise, it's which bottle you prefer.
yep. Pick one of those 2, and you’re good to go. I would say pick Valvoline, but someone will come on here and tell how they use Motul in their diff and never blew up lol.
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