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Holland, Indiana (SW IN) | Nothing to lose but $20 we’ve used Bars Leak
Put a treatment almost every year in a Big Cam 300 for over 10 years start external leaking dump in another bottle or 2
Only ran it 2000 miles a year
Finally sold the tandem dump 6 years back best I know still moving
Never choaked the heater core —
Older 855 Cummins and stop leak seemed made for each other
We keep Bars Leak ready in our shop
FWIW Case’s guarantee for Magnum 340 bottom of liner leaks is some expensive stop leak Case calls coolant conditioner
Dan
Edited by Dan Loehr 11/6/2025 19:03
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Coolant Stop Leak in Cummins ISX
