Flush out everything that you have and then replace with new. That way you know for sure what you're dealing with. Napa kool is for conventional green antifreeze. Peak final charge, prestone 50/50, and all other antifreezes will have their own seperate additive package depending on the type of coolant(conventional,OAT, or HOAT). You can use an ELC but those require a specific test strip in order to check coverage levels.
You don't want a cocktail of coolants in there. #1 reason is not every coolant is compatible with others and you can turn the whole works into sludge by mixing the wrong types.#2 reason is that when you have multiple additive packages present, you'll find that none of them will work effectively, thus leaving you unprotected.
I use regular green in mine.
Why?
Because I'm not going to be driving it a million miles in order to justify the extra expense of an ELC. Regular green works for me, and will work for everybody that has an older bus(pre-egr/emissions).
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