Is there a recommended high mileage / seal additive for transmission & steering fluid?

[CharlieBauer]

I have a stock of transmission and power steering fluid for an older vehicle.

Everything works well but I'm worried about seal leaks. Is there a recommended additive focused on that aspect of high mileage?

 

[JavierH19]

at 205 but use less of it than directed. It's a strong plasticizer that usually overdoes it and causes seals to rupture. It's .75oz per quart if i remember correctly but I'd say half of that or less.

 

[Lubener]

If you have no leaks right now, I wouldn't add anything. That could negatively affect hydraulic seals internally with your transmission.

 

[B1974]

Top off any low fluids and keep an eye on them. I wouldn't start adding "seal sweller" unless it's more then top it off every now and then at this point.

 

[SC Maintenance]

I suck out the PS fluid with a turkey baster and replace it every so often. I try to do it just after its been run so hopefully any sediment, etc has been shaken into suspension. I wear good gloves so as not to burn myself.

I agree with sticking to OEM spec fluid if its not leaking now. You don't want to swell seals that are still good.

 

[wlk]

You could try Lubegard Red

 

[nate379]

What transmission.

Many only have a couple seals.

 

[Plawan]

They make high mileage atfs and power steering fluids. As long as it’s suitable for your application I don’t think it’s gonna harm anything. I wouldn’t use a high mileage additive or any additive except maybe Lubegard in a transmission, myself, unless it’s was leaking already and I didn’t want to put time or money into fixing it.

 

[himemsys]

Prestone makes a PSF with stop leak. Not sure about transmission, but you're not saying you have a leak, just that you're worried you might get one. At least that's how I understood your phrasing. I would continue using OEM fluids and if a leak develops, deal with it then.

 

[ryanschillinger]

Only seal conditioner I’ve used with success is ATP AT205. Used it as directed and a good example is my 69 Ford. Used to leave puddles of trans and engine oils after sitting a month or so. Not bone dry or anything but barely leaves drops. Worked well in a few other vehicles without any problems.

 

[Revving2Redline]

SEAL FIXX - Lubegard

www.lubegard.com

You can use the hotshots shift restore at 2.4 percent per quart in the automatic transmission.

Shift Restore Automatic CVT Transmission Additive

Hot Shot's Secret's Shift Restore helps dissolve harmful gum & varnish that forms in automatic & CVT transmissions over time. Try it today!

www.hotshotsecret.com

 

[nicholas]

You could try Lubegard Red

That worked for me a few times