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Old 07-04-2008, 09:54 AM
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Motor oil leak stop. How does it work?

I put full synthetic oil in my Harley and now it leaks like crazy. I know they are suppose to leak but not like this.
So I am about to get the synthetic out of there. I know it is not helping.
This got me thinking about leak stop for oil leaks. I used bars leak stop in my old Accord and it really worked.

So how does the stuff work? Does anybody know for sure? Does it make gaskets swell or coagulate the oil or something... Are they bad for a motor?

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Old 07-04-2008, 10:24 AM
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I have wondered the same thing and although I have never used that stuff I have seen it used and it does appear to work. One instance was on an old farm tractor that was leaking badly in several places but after the guy "treated" it the oil leaks had almost stopped, I would have to wonder what else it does inside the engine though and I don't think I would put it in something as valuable as that Harly. About 20 or so years ago one of the guys who worked at my shop had an 81 Ford truck that was not just leaking it was gushing out power steering fluid and one of the other guys told him to put some brake fluid in it. He was told to use about a tablespoonful but he poured more like a couple of ounces in it, worked like a charm! He sold the truck about 6 months later and it still had not started leaking again so maybe that oil leak stuff works the same way. I had always just assumed the brake fluid caused the rubber seals in that power steering to swell but whatever it was it sure did not take it long to stop leaking!

I am NOT suggesting that anyone do this!!!
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Old 07-04-2008, 11:37 AM
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That's exactly what some of the leak stop stuff does....swells the seals and gaskets. Your old brake fluid trick is simply an old mechanic's trick from many years ago. Assuming you don't overdo the brake fluid, it won't hurt anything.

Synthetic oil has a way of going where other oils won't. It might not be a bad idea to ask a Harley mechanic if they have something they use, or maybe they don't recommend the use of synthetics.
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Old 07-04-2008, 02:59 PM
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Yeah I was told by a Harley mechanic these motors don't need or like synthetic oil. I am changing it out today.

I always heard that the brake fluid trick worked but long term it made the seals turn hard and then would cause big ol leaks.
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