Found oil in the coolant.
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Where and how bad was it leaking before you added stop leak? At this point you probably really need to determine if it is an oil leak. I would say to drain the coolant, refill with water and run a good coolant system flush through the system. drain and refill with just water. then run it for a day or two and monitor it constantly to see if it is an oil leak or just the stop leak. Just don't forget to drain and refill the antifreeze before winter if it all checks out okay.
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The previous owner put the crap in there because he didn't want to take the time to cut a hose.. Smh. But I did flush it ran it, still has some stop leak in it but determined it wasn't an oil leak because when you leave the rad cap off and watch the coolant there is no bubbling which is a sure sign of no leak.. However my thermostat for some reason wouldn't open when I started the thing back up and about screwed my engine. So I'm thinking I'm going to ditch the thermostat since it serves no real purpose unless you live in the tundra .
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