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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

does stop leak really work

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Old May 8, 2006 | 08:03 PM
  #1  
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does stop leak really work

i have had a slow leak in the rear main, just today I change the oil and noticed another very slow leak further back and to the left if your looking from the front of the truck. (it's motor oil) it by my oil pan. what could be leaking back there? and does stop leak work. don't know much about this kind of stuff yet. only 19.
 
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Old May 8, 2006 | 08:04 PM
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i replaced my pcv valve also.
 
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Old May 9, 2006 | 12:20 AM
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My one friend tried that cr@p on an old 4 banger chevy car he had and it didnt stop anything, I would have to say no.
 
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Old May 9, 2006 | 05:09 AM
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If you replaced the PCV valve, I'd clean everything up good and watch it awhile. If it's slow, it's not dangerous. Make sure that you're not overfull and watch awhile. I'd stay away from pouring anything in just yet.
 
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Old May 9, 2006 | 05:09 AM
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If you replaced the PCV valve, I'd clean everything up good and watch it awhile. If it's slow, it's not dangerous. Make sure that you're not overfull and watch awhile. I'd stay away from pouring anything in just yet.
 
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Old May 9, 2006 | 10:49 AM
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I never had a any luck with it.....
 
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Old May 9, 2006 | 11:01 AM
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Nah, that garbage neverworks. It either makes the oil thicker or swells the seals. The thing with the seal swelling is that when the additive is not in the oil, the sealshrinks backand could make the leak worse(so I've been told). Never been a fan of that stuff. The only leak stop stuff that works is the coolant stuff.
 
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Old May 12, 2006 | 04:17 PM
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dont wast money

i just put in a rear main seal in my 90 f250 5.8 and i tryed that crap first its just a wast of money the seal cost me 14 dollars at napa and a days wroth of work and i know that i will not have to do it ever agin that stop leak cost as much as the seal it self and will have to still be changed at some point
 
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Old May 12, 2006 | 04:43 PM
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Is replacing the rear main hard to do. Im 19 and not that mechanically inclined?
 
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Old May 12, 2006 | 05:24 PM
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Originally Posted by breisr
Is replacing the rear main hard to do. Im 19 and not that mechanically inclined?
If it's a 1 piece rear main seal, the transmission will have to be removed to replace it. Not a fun job if you don't have the tools or equipment.
 
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Old May 12, 2006 | 06:26 PM
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Yes, it works

Stop leak does work in some cases, but it mostly clogs up the works, any small passages will clog and cause hot spots, clog tubes in the radiator, adversly affect the thermostat, all bad things, definitely. The coolant system is very important, should be maintained and monitored on a regular basis, and I know you're aware of this. A friend used Bar's Leak and the water pump in the Bronco grenaded shortly after that. I carry some in the Bronco when I'm off road and only in an emergency.
 
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