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That's how Motorcraft has chosen to label the bottle. It is not my description. ;) Thanks for your two cents! sir. Apparently, you didn't catch the posted update a little farther down in the thread, or where the issue of blending winter grades was resolved. And, one can indeed "blend"...

Update - and thanks again to those who've replied. Looking back, I had acquired 490 miles by about November 4th, prepped my PML finned aluminum diff cover (w/ included stainless hardware!) for the break-in drain, interior diff housing wipe clean, cover flange clean and prep for cover, using...

Well, that's pretty obvious. I am very familiar with how a helical gear-type LS works and the sheer simplicity of the aggregate components. I had simply asked here about blending additive packages, and it has been determined that that's not great idea. Point taken. That had answered my...

Thank you for the feedback! I do not mean to threadjack but I will respond to your point: I actually called EATON and spoke to the man who picked up the Detroit Truetrac tech line... to ask him directly about their Owners Manual-published rec of 80W-90, that I had been looking specifically for...

Very good. This is exactly why I posted my question to begin with: to hear experienced replies. And our good friend MK suggested I use a synthetic when it was previously stated here in this thread that a synthetic was not desired in this case (is synthetic desireable? YES. In just about...

Thanks 4WD for your reply. Is that Amsoil product a conventional? or a synthetic... I'm looking to use a conventional oil. I ask because I'm not finding an Amsoil 75W (or 80, 85) - 110 that is not a synthetic.

One more time: I suppose I have clouded the question here so I'll post it again. Of the two lubricants linked in bold in my first post, are there any concerns w/ blending their respective additives? Or is this question unanswerable? The question is not conventional vs. synthetic. These are...

I don't have an answer for you but I do have a use case to report. I have just had installed an EATON Detroit Truetrac helical gear-type limited slip differential in the rear axle of my 2016 Ford F150... and in EATON's manual supplied with the diff it states: 80W-90 conventional lubricant...

Thank you for your reply! Ah! Yes. I know it's out there, but it is a synthetic when I wish to stay with a conventional lubricant as per EATON's recommendations. Thanks again.

Conventional oil (with little to no friction modifier/s added) recommended for my axle's recent EATON Detroit Truetrac installation, EATON's rec being 80W-90. Installer used for a new ring-and-pinion break-in period a complete 2.75 qts fill using conventional 85W-140. Liking the idea of 140...

Planning a diff cover swap in a couple o' hunnert miles when my new ring-N-pinion sees 500 when it gets a gear lube change. Thanks to this thread I have on the way some high-temp thread sealant for the new cover's fill plug, Ultra Grey RTV for the gasket and then Loc242 for the cover studs (3...

I should add that future runs "up the interstate" and into the western states' Mojave desert will include light towing of a 3000 lb, single-axle box trailer-turned camper sized 5' X 5' X 10', hence the nod to perhaps the greater film strength of any heavier gear oil.

One year, two weeks later... Greetings. First post here on BITOG. I found this thread yesterday while poking around for info as I have just had installed last week an EATON Detroit Truetrac helical gear limited slip differential in my 2WD 2016 F150 SuperCrew's 8.8" Super rear axle, along with a...