Hello everyone,
I have an 06 Mega with the 5.9 and needed to add coolant. Will be flushing soon but need to add before a trip this weekend. I have a jug of dex-cool left over from my GMC ownership and was wondering if it is compatable with the stock coolant. I searched but all I could find were recommendations for what to run after a complete change.

BTW I would just go to the auto parts store but I have to pull a 12-hour shift today and won't have time. Then leaving bright and early tomorrow. Thanks!