For context, approximately two months back, I solved a 'slight' coolant leak using Bar's Leak. As a result, I decided to post and log my solution (based on research) so that others could rely on my experience(s). For post see
Bar's Leak has not messed up my heater core, as Jim Warmen proposed. For those who use Bar's Leak, I would recommend a flush (no chemical flush required), with water and coolant after a few days of placing the product in the coolant system. Although the product states that it can be left in the system, as many car manufacturers do when placing Bar's Leak in their production cars, Id flush after correcting the leak.
So again. For SMALL (less than 1/3 cup a day) leaks, attributed to a failing lower intake manifold gasket (freaking thing is made of paper), Id do a full flush once the leak has been corrected.
So the question is, keep replacing the gasket and wasting time, effort, and money. Or take some preventative measures, and introduce Bar's Leak into the coolant system and allow for a complete seal.
I chose Bar's Leak, since Ford's have a reputation for having a problem with the lower intake manifold gasket. They should Bar's Leak every Ford that comes off their production lines.
Cheers- and I hope it helps those who are seeking other viable solutions than the one that your mechanic or dealer proposes.