Is there any issue with mixing the Kroil and MMO that I already have in there? Some chemistry ditty "Add MMO to Kroil, never the reverse"?

I will read through the other threads, and I have read some already. I am really just wondering if rocking it back and forth in gear with a piece of heavy equipment is an actual solution, or if it steps over the redneck boundary.


1959 Chevy Viking. Belonged to my Great Grandfather