So can I use this if I have a noisy diff but a non limited slip?

No, for a noisy diff I would look at a Lucas oil...after you have checked to make sure the noise isn't being caused by the bad news fairy. Take it to tech and have them check the gears. Or crack it open yourself and look for metal shavings.

does my 2005 4.6L lincoln town car use this? cant find any info

IF your Town Car has a limited slip differential then this fluid is indeed the proper additive if you are going to be renewing the gear oil in your T C.

can this be used on my 1997 awd mercury mountaineer

This is used for a clutch type rear end?

must I change differential oil before adding or can I add to oil already in it?

You could add it to the oil that's already in there but you may need to remove some oil to make room. BTW, Diff oil should be changed at 100K.

Genuine Ford Xl 3 Friction Modifier Additive 4 Oz

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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Quiet power, engineered for the discerning driver

OEM TRUSTED - Genuine Ford Motorcraft additive, guaranteed compatibility and performance
SILENCE THE DRIVE - Reduces limited slip differential chatter for a smoother, quieter ride
ENGINEERED PRECISION - Formulated specifically for hypoid gears to minimize friction and wear
DRIVE WITH CONFIDENCE - Follow your owner’s guide for optimal noise reduction and gear longevity
EFFORTLESS APPLICATION - Tapered neck applicator ensures mess-free, precise dosing every time

The Genuine Ford XL-3 Friction Modifier Additive is a 4 oz precision formula designed to reduce chatter and hypoid gear noise in specific limited slip differentials. Trusted by Ford and formulated for automotive use, it enhances lubricant performance and extends gear life. Featuring a tapered neck applicator for easy, accurate application, this additive is a must-have for maintaining smooth, quiet vehicle operation.

Specifications

ASIN	B000NU5LP6
Brand	Motorcraft
Customer Reviews	4.8 4.8 out of 5 stars (3,656)
Date First Available	September 15, 2013
Exterior	Painted
Is Discontinued By Manufacturer	No
Item Weight	141 g
Item model number	XL-3
Manufacturer	Rain-X
Model	XL-3
OEM Part Number	0, XL-3, XL3

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