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Old 10-24-2007, 10:10   #1 (permalink)
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Ford 9" rear end oil change! additive a must?

Hi

I´m going to make an oil change in my ford 9" inch rear end.
Ive been told that I should use either a Hypoid W80/90 or W85/140.
Now to the point, ive also been told that the ford 9" rear end needs an additive mixed with the oil becouse of the traction lock?!?

The thing is that it seems almost impossible to get this additive here in sweden, so is it really a must to use this additive?

Best regards Gustaf
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Old 10-29-2007, 15:47   #2 (permalink)
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Re: Ford 9" rear end oil change! additive a must?

the additive puts in a friction modifier to help out the limited slips clutches to "grab", it will work better and last longer with the additive.
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Old 12-10-2007, 17:43   #3 (permalink)
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Re: Ford 9" rear end oil change! additive a must?

I use the additive even with synthetic fluid if you want to go that route. As good as synthetics are, most state you don't need the friction modifier but I use it anyway. After adding synthetics in the gears, transfer case, transmission and engine i've noticed a 4-5% increase in fuel economy in my dodge and just trans and engine oil in my taurus I've seen as high as 10% increase on the highway. Synthetics are the real deal.
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