So another dumb question, but I can't find either one here on the shelves to read the labels.
What is the difference in 405 and 409 and which one is better.
I live where the avg. temp is 60 and the low is 40 and the high is 100. Mostly dry with only rain on occassion, never any snow or ice, don't know what a block heater is and thought they gave me a 'Bra" for my truck when I found the "winter front" under the back seat LOL ha ha ha
I bought the FFFFFFFFPPPPPPPP concentrate stuff last time and about out, so need to replace it. Sounds like the Primrose stuff is better, but which one 405 or 409?
I will look for it the next time I am near a truck stop.
Thanks