Penrite is good stuff I wouldn't be afraid to use it.
I live in the middle of the Cornbelt in Illinois and am retired from John Deere. Our local Deere dealer has all kinds of it no problem I was just in there last month and saw it on the shelf in the display area.
I have two tubes at home so didn't need anymore now.
I'd say that guy is just blowing smoke up your you-know-what just to get rid of you
