Best Value Differential Oil 75W-90

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As the subject title suggest I'm looking for something for non-limited slip differentials in a 1-ton Chevy & 1/2 Ton RAM. Figure I'll change it every 2-years or 50K miles.
 
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Valvoline synpower 75w90 is usually available for around 8.99/qt or so. another good one is Castrol Syn 75w90. its usually priced the same. you could also use supetech 75w90 synthetic from walmart for around $6/qt i believe. Personally im a fan of the Valvoline 75w90
 
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The 75w-90 at Wally is GL-5 rated. Not expensive and your diffs won't know the difference.
 
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OP wants BEST VALUE The problem I found the last time I changed my Gear Oil was "Selection" It was either Valvoline or Lucas.
 
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If Lucas is free then I may use it, I refuse to pay even 1 penny for any Lucas product. Which defines "Best Value" ? The one you pay less upfront but change more often or the one you pay more but change less ? How about someone take their vehicle to garage or dealer for maintenance, do you account labor cost ? How about higher upfront cost but extend the life of the critical part(s) by several years and thousands of miles ? For a long interval such as transmission fluid and gear fluid I rather pay more upfront cost and change it less often, Amsoil SVG is an excellent choice.
 
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Best Value? Supertech syn blend.. <5$/qt I prefer motul gear 300 or redline though. Schaeffer's Oils are too hard to acquire.
 
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Originally Posted By: HTSS_TR
If Lucas is free then I may use it, I refuse to pay even 1 penny for any Lucas product. Which defines "Best Value" ? The one you pay less upfront but change more often or the one you pay more but change less ? How about someone take their vehicle to garage or dealer for maintenance, do you account labor cost ? How about higher upfront cost but extend the life of the critical part(s) by several years and thousands of miles ? For a long interval such as transmission fluid and gear fluid I rather pay more upfront cost and change it less often, Amsoil SVG is an excellent choice.
^^This hands down
 
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Originally Posted By: Rand
Best Value? Supertech syn blend.. <5$/qt I prefer motul gear 300 or redline though. Schaeffer's Oils are too hard to acquire.
+1 if you're changing it every 2 years Supertech syn blend is your best bet. As mentioned earlier, your gears wont notice any difference.
 

KevinP

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Changing it is easier than an oil change so I don't really add labor. I have a pump so I just stick a hose in and pump it out and reverse it and pump the new in. I just used the ST so I am feeling justified although it was $5.33 qt.
 
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I buy Valvoline because it is usually at a low price and most auto part stores have it in stock. I have heard that SuperS gear oil costs less, but I only see it at K-mart.
 
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