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Q: 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.

Q: 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.

Q: can this be used on my 1997 awd mercury mountaineer

This is used for a clutch type rear end?

Q: 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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⚙️ Quiet the noise, own the road.

OEM TRUSTED FORMULA - FordGenuine additive ensures compatibility and peak performance
SILENCE THE CHATTER - Reduces annoying limited-slip differential noise for a smoother ride
DRIVE WITH CONFIDENCE - Enhances differential efficiency, giving you that edge on every journey
COMPACT CONCENTRATED - 4 oz. bottle packs powerful friction modification in a small package
PRECISION GEAR PROTECTION - Formulated to minimize hypoid gear wear and extend drivetrain life

FordGenuine XL-3 Friction Modifier Additive is a 4 oz. premium formula designed specifically for limited-slip differentials. It reduces chatter and hypoid gear noise, ensuring smoother operation and enhanced drivetrain longevity. Trusted by Ford and manufactured by Rain-X, this additive delivers OEM-level performance for discerning drivers seeking quiet, efficient rides.

Have a Question? See What Others Asked

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

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

can this be used on my 1997 awd mercury mountaineer

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

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Manufacturer	Rain-X
Brand	Ford
Model	XL-3
Item Weight	4 ounces
Item model number	XL-3
Is Discontinued By Manufacturer	No
Exterior	Painted
Manufacturer Part Number	XL-3
OEM Part Number	0, XL-3, XL3

FordGenuine XL-3 Friction Modifier Additive - 4 oz.

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