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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Upgrade your ride’s quiet power with Ford’s XL-3 additive!

OEM TRUSTED - Genuine Ford Fluid ensures compatibility and peak performance
EASY INTEGRATION - Simply add to your lubricant as per owner’s guide—no hassle
SILENCE THE CHATTER - Smooth out limited-slip differential noise for a quieter ride
PRECISION FORMULATED - Engineered specifically for automotive friction reduction
DRIVE WITH CONFIDENCE - Reduce hypoid gear noise and extend differential life

Genuine Ford Fluid XL-3 is a 4 oz friction modifier additive designed to reduce chatter and hypoid gear noise in certain limited-slip differentials. Formulated for automotive use and recommended by OEM guidelines, it enhances lubricant performance to ensure smoother, quieter, and longer-lasting differential operation.

Specifications

ASIN	B000NU5LP6
Best Sellers Rank	#34,135 in Automotive ( See Top 100 in Automotive ) #179 in Oil & Fluid Additives
Brand	Motorcraft
Customer Reviews	4.8 4.8 out of 5 stars (3,849)
Date First Available	March 4, 2011
Exterior	Painted
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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€ 43.95

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

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

Description

Specifications

Common Questions