I have a small rear main leak in my 150,000 mile F-150.

I found some stuff at the auto parts store that you dump in your oil that is to re-condition the seals and slow or stop the leak.

Anyone ever used this and had any luck with it? Seems too good to be true!!!

 

It is too good to be true. I t may help but the only way to really stop it is a new seal.

 

I honestly feel those products are not worth it, they help but its like putting a band aid on bleeding wound...it may help in the short term but long term will have other effects, ive tried some similar products on my brothers Nissan and that was with varied results honestly...

 

be cautious. You only get what you pay for.

 

No way. If anything it will gum stuff up.

 

Lucas and Seafoam are the only 2 additives I ever use and recommend.

 

I havent used seafoam yet but I do use lucas a lot and it does seem to work quite well for the ol girl, I mainly use the power steering pump fluid but Im going to try some of there other fluids to see how they work!

 

used two bottles of lucas power steering fluid to stop a bad leak i was having. didnt really want to spend the time replacing the pump so i got two bottles and filled the reservoir up. stopped the leak completely. it used to leak like a sieve. with 1 bottle it went to a few drops and now its stopped completely. if youre going to use any band aid fluid then use lucas stuff

 

as far as i can tell Lucas is still technicially a band aid fluid but I threw that in my brothers Nissan that had a leak just like your sieve leak and it cured that and it hasnt happened yet and thats been at least 4 years now still on original parts too, all i do is periodically change the fluids out as needed/recommended

 

there are fluids that are designed to be bandaid fixes (the head gasket, radiator, seal, etc "leak stoppers"), and there are fluids, like lucas, that are designed to prolong the life of worn parts/prevent excessive wear on new parts. when these are used, the slowing/stopping of small leaks is a side-effect of the intended purpose. yes, the lucas products can slow/stop leaks. . .but that is not their designed purpose.

"but '89f2urd, lucas sells a bottle called 'leak stopper'"

yes, they do, but thats a variant of the lucas oil treatment and is only one "leak stop" product out of a dozen application-specific fluids.

there is nothing better to run in a new/old power steering pump than lucas.

 

amen.i use a quart of lucas in every vehicle i own each oil change. i use thier gear oil, transmission additive when changing trans fluids. and seafoam every oh 6 months or so. all my vehicles are at the 200k mark and still run great.

 

The stop leak stuff that is supposed to 'recondition old seals' is usually a solvent like toluene or xylene which softens rubber and causes it to swell up and may stop your leaking or slow it down.

It will work for a while but the rubber will begin to break down then everything will begin leaking. front seal, valve covers, valve seals. it will effect anything rubber in the engine that it comes in contact with.

Scott