So I was digging in my shop and found 2gal of CH-4 and 3gal of CI-4 Delvac 1300 oil. Obviously it's been sitting there a while, but not more then 7years I don't think. Is the additives and detergents still good? I'll be using it in my 2006 Duramax that doesn't see much use. I think I was mixing the older oils in with the newer stuff due to the changes in the CJ and Ck oils and well maybe it's been sitting too long now.
Thanks
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