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 Fluid Xl 3 Friction Modifier Additive 4 Oz

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Silence the noise, amplify the drive.

EASY INTEGRATION - Simply add to your existing lubricant following your vehicle’s owner guide.
OEM APPROVED FORMULA - Genuine Ford Fluid XL-3, trusted and recommended by manufacturers.
BOOSTS GEAR LONGEVITY - Reduces surface friction to extend the life of your differential components.
PRECISION 4 OZ BOTTLE - Compact size ensures exact additive amounts for optimal performance.
SMOOTH RIDE ZERO CHATTER - Specifically engineered for limited-slip differentials to eliminate annoying gear noise.

Genuine Ford Fluid XL-3 is a 4 oz friction modifier additive designed for limited-slip differentials. It reduces chatter and hypoid gear noise by lowering surface friction, ensuring smoother gear operation. OEM-approved and easy to use, it enhances differential performance and longevity when added according to manufacturer guidelines.

Specifications

ASIN	B000NU5LP6
Best Sellers Rank	#5,490 in Automotive ( See Top 100 in Automotive ) #48 in Oil & Fluid Additives
Brand	Motorcraft
Customer Reviews	4.8 4.8 out of 5 stars (3,817)
Date First Available	March 4, 2011
Exterior	Painted
Is Discontinued By Manufacturer	No
Item Weight	5 ounces
Item model number	XL-3
Manufacturer	Rain-X
Manufacturer Part Number	XL-3
Model	XL-3
OEM Part Number	0, XL-3, XL3

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