C7 Diff oil?
06-18-2018, 08:32 PM
#1
Le Mans Master
Thread Starter
C7 Diff oil?
Hi all,
Is the recommended C7 differential fluid weight the "LS" 75w-90 gear lube?
Assuming so, but the OM is pretty vague... just says "Dexron LS", with no viscosity spec given. I have yet to see Dexron LS in anything except 75w-90, but I do see "Mobil1 LS" in both 75w-90 and 75w-140.
Anyone use or recommend the heavier 75w-140 in their street-driven C7? Does the standard diff/e-diff equipment make any difference?
(My preference is always towards Mobil1 products, and in my C6 days, it was believed that Mobil1 LS and Dexron LS were, in fact, the same oil in different labels, and that Mobil1 actually manufactured the LS product for ACDelco.)
Is the recommended C7 differential fluid weight the "LS" 75w-90 gear lube?
Assuming so, but the OM is pretty vague... just says "Dexron LS", with no viscosity spec given. I have yet to see Dexron LS in anything except 75w-90, but I do see "Mobil1 LS" in both 75w-90 and 75w-140.
Anyone use or recommend the heavier 75w-140 in their street-driven C7? Does the standard diff/e-diff equipment make any difference?
(My preference is always towards Mobil1 products, and in my C6 days, it was believed that Mobil1 LS and Dexron LS were, in fact, the same oil in different labels, and that Mobil1 actually manufactured the LS product for ACDelco.)
06-18-2018, 09:45 PM
#2
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St. Jude Donor '13
Somewhere in the OM I believe it also gives part numbers for the fluids, you should be able work backwards from there to find the viscosity.
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Kent1999 (06-19-2018)
06-18-2018, 09:57 PM
#3
Melting Slicks
Hi all,
Is the recommended C7 differential fluid weight the "LS" 75w-90 gear lube?
Assuming so, but the OM is pretty vague... just says "Dexron LS", with no viscosity spec given. I have yet to see Dexron LS in anything except 75w-90, but I do see "Mobil1 LS" in both 75w-90 and 75w-140.
Anyone use or recommend the heavier 75w-140 in their street-driven C7? Does the standard diff/e-diff equipment make any difference?
(My preference is always towards Mobil1 products, and in my C6 days, it was believed that Mobil1 LS and Dexron LS were, in fact, the same oil in different labels, and that Mobil1 actually manufactured the LS product for ACDelco.)
Is the recommended C7 differential fluid weight the "LS" 75w-90 gear lube?
Assuming so, but the OM is pretty vague... just says "Dexron LS", with no viscosity spec given. I have yet to see Dexron LS in anything except 75w-90, but I do see "Mobil1 LS" in both 75w-90 and 75w-140.
Anyone use or recommend the heavier 75w-140 in their street-driven C7? Does the standard diff/e-diff equipment make any difference?
(My preference is always towards Mobil1 products, and in my C6 days, it was believed that Mobil1 LS and Dexron LS were, in fact, the same oil in different labels, and that Mobil1 actually manufactured the LS product for ACDelco.)
Last edited by BJ67; 06-18-2018 at 09:58 PM.
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Kent1999 (06-19-2018)
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Kent1999 (06-21-2018)
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Kent1999 (06-21-2018)
06-21-2018, 02:27 PM
#6
Hi all,
Is the recommended C7 differential fluid weight the "LS" 75w-90 gear lube?
Assuming so, but the OM is pretty vague... just says "Dexron LS", with no viscosity spec given. I have yet to see Dexron LS in anything except 75w-90, but I do see "Mobil1 LS" in both 75w-90 and 75w-140.
Anyone use or recommend the heavier 75w-140 in their street-driven C7? Does the standard diff/e-diff equipment make any difference?
(My preference is always towards Mobil1 products, and in my C6 days, it was believed that Mobil1 LS and Dexron LS were, in fact, the same oil in different labels, and that Mobil1 actually manufactured the LS product for ACDelco.)
Is the recommended C7 differential fluid weight the "LS" 75w-90 gear lube?
Assuming so, but the OM is pretty vague... just says "Dexron LS", with no viscosity spec given. I have yet to see Dexron LS in anything except 75w-90, but I do see "Mobil1 LS" in both 75w-90 and 75w-140.
Anyone use or recommend the heavier 75w-140 in their street-driven C7? Does the standard diff/e-diff equipment make any difference?
(My preference is always towards Mobil1 products, and in my C6 days, it was believed that Mobil1 LS and Dexron LS were, in fact, the same oil in different labels, and that Mobil1 actually manufactured the LS product for ACDelco.)
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Kent1999 (06-21-2018)
06-23-2018, 05:21 PM
#7
Le Mans Master
Wait, the Mobil and Redline have the additive already?
06-24-2018, 06:00 PM
#9
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St. Jude Donor '13
06-24-2018, 11:11 PM
#11
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ttt
AMSOIL on all my stuff.
06-25-2018, 03:03 PM
#12
Le Mans Master
