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Coolant Compatability

410 Views 0 Replies 1 Participant Last post by  omalley1537
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!
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