I think myself and others might be wondering who this is directed to?Please. Supply any proof with actual examples of damage that has been done. Hearsay doesn't count.,,
The truth is that if both oils have an API license then they have met the requirements of ASTM D6922 which guarantees the oils will be miscible and not cause harm. The only unexpected result is for the winter rating, there is no guarantee the mixture will meet the rating of either of the mixed oils. It also does not guarantee the mixture will meet any license, specification nor approval of the mixed oils either. But there will be no harm.Maybe I should have been more specific in my question -- I have read many cautions here about potential unexpected results from mixing different brands with different additive packages.