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Message: <blockquote data-quote="155mm" data-source="post: 644155" data-attributes="member: 9662">After looking around at a few forums and also the Red Line tech information summary (<a href="http://www.redlineoil.com/content/files/tech/Gear%20Oil%20Tech%20Info.pdf" target="_blank">http://www.redlineoil.com/content/files/tech/Gear%20Oil%20Tech%20Info.pdf</a>) it seems that the 75w140 will give you less wear at higher temperatures, while the 75w85 would give you more power due to higher friction. Since Ford says not to use any FM in the rear diff, I'm guessing they are prioritizing power over wear. The 75w-85 is also the spec'd fluid for the GT500.The Ford product is listed as <a href="https://www.fcsdchemicalsandlubricants.com/main/product.asp?product=SAE%2075W-85%20Premium%20Synthetic%20Hypoid%20Gear%20Lubricant&category=Transaxle%20Fluid" target="_blank">https://www.fcsdchemicalsandlubricants.com/main/product.asp?product=SAE%2075W-85%20Premium%20Synthetic%20Hypoid%20Gear%20Lubricant&category=Transaxle%20Fluid</a> but I think you'd have to go through a dealer...I haven't found an "over the counter" 75w85 without the friction modifier, but there may be several 75w90s without the friction modifiers available. So far I've seen Red Line and Advance Auto Parts brand (but this store brand is probably a synthetic blend, not full synthetic). Lucas oil doesn't really say on their website and you can't see from the bottle picture whether their 75w90 has FM or not. Royal Purple and Amsoil both look to have FM already included.</blockquote>

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