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.

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

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

Product ID: 3589896

🔇Lowers hypoid gear noise

⚙️Reduces differential chatter

🛢️4 oz precision dosing

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€ 26.04

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Description

⚙️ Silence the noise, feel the power — Ford’s friction modifier for the smoothest ride.

EASY INTEGRATION - Simply add to your differential lubricant as per your vehicle’s owner guide.
WHISPER QUIET GEARS - Effectively reduces hypoid gear noise for a more refined driving experience.
OEM APPROVED FORMULA - Genuine Ford additive designed to meet exact manufacturer specifications.
TRUSTED BY THOUSANDS - 4.8-star rating from over 3,700 users proves its reliability and performance.
SMOOTH RIDE NO CHATTER - Specifically engineered for limited-slip differentials to eliminate annoying clutch chatter.

Genuine Ford Fluid XL-3 Friction Modifier Additive is a 4 oz. precision-formulated product designed to reduce chatter and hypoid gear noise in limited-slip differentials. OEM-approved and highly rated, it enhances drivetrain smoothness by lowering surface friction in lubricated parts, ensuring a quieter, more comfortable driving experience.

Specifications

ASIN	B000NU5LP6
Best Sellers Rank	#2,133 in Automotive ( See Top 100 in Automotive ) #23 in Oil & Fluid Additives
Brand	Motorcraft
Customer Reviews	4.8 4.8 out of 5 stars (3,791)
Date First Available	March 4, 2011
Exterior	Painted
Is Discontinued By Manufacturer	No
Item Weight	4 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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