Lynch Stop Leak Coolant Additive Bad for Coolant?

[John With Beastly 302]

I have a 94' Mercury Sable with the 3.0 Vulcan V-6 with 194,000 miles. I changed the standard green coolant back in June with just regular standard green Coolant. My coolant was going somewhere before but it was not obvious were so I added a bottle of Lynch Cooling System Stop Leak and Sealer right after I thouroughly changed my coolant which did not take care of my leak. So I added another bottle which took care of my leak because the level in my overflow tank is not dropping. All together there are 2 botttles of Lynch Coolant additive stop leak in my coolant. Now thinking to myself I worry that adding this stop leak may be causing damage that I am not aware of, is this possible?

 

[Boss302fan]

Seemed to help your leak. With those miles I would not be worried about the stop leak product. You may have had a intake gasket leak and the stop leak plugged it up. Sounds like it did its job...

 

[pbm]

The only possible problem that I can think of is a blocked heater core but I wouldn't worry about it in California.

 

[The_Eric]

If that model has a catalytic converter right off the rear manifold, check the timing cover. Those with the converter so close seem to cook the timing cover gasket and cause it leak by the cylinder head.