Back in the late 70's early 80's I was a mechanic at a *yeah get this" a AMC/JEEP/RENAULT, Buick, Honda dealership and we were required to put 2 Large Tablets of AMC/JEEP Stop Leak in every new car prep. I think it was a service dealer bulletin for possible bad head casts or head bolt torque. We used call them give your JEEP a pill. Came in 2 pack. This stuff was the BEST. This still around? THX!

 

One might be surprised at how many shops (dealer & independent) that use/add some form of stop leak after any cooling system work.

 

I just use egg whites.