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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Description

⚙️ Quiet your ride, own the road.

SILENCE THE CHATTER - Effectively minimizes limited-slip differential noise for a smoother ride.
OEM APPROVED FORMULA - Genuine Ford additive engineered to meet exact manufacturer specs.
TRUSTED BY THOUSANDS - 4.8-star rating with nearly 4,000 reviews—join the satisfied drivers.
BOOSTS GEAR LONGEVITY - Reduces surface friction to protect your differential’s internal components.
PRECISION 4 OZ BOTTLE - Perfectly sized for targeted application without waste or mess.

Genuine Ford Fluid XL-3 is a 4 oz friction modifier additive designed specifically for limited-slip differentials. It reduces clutch chatter and hypoid gear noise by lowering surface friction, ensuring smoother performance and extended gear life. Trusted by thousands with a 4.8-star rating, this OEM-approved formula is a must-have for Ford owners seeking quiet, reliable differential operation.

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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Genuine Ford Fluid XL-3 Friction Modifier Additive - 4 oz.

Description

Specifications

Common Questions