Another couple of questions have popped up.
I've got 2 gallons of Porsche coolant from years back. Actually, it was from July, 2011, the last time I had the coolant out. See why I'm doing a R/R on the water pump? It's not leaking, but it's just gotta be time.
Q1: The info on the 2 gal of antifreeze includes: On the front - Formula G-30-91-EF
and on the back is the part number, 000 043 301 05.
Just picking one supplier (Pelican), the part number they list is 000 043 305 75 M100. (I can't read the Formula number on the Pelican page.)
I need to pick up another gallon. Can I assume my old (but unopened) stuff is the same (or at least compatible with) the currently available stuff?
Q2: This one just popped into my head. With Porsche saying (I think) that this is forever coolant, I've never all that closely kept track of how old mine was. Clearly I change it every time I do a WP/t'stat, but (just as clearly) I probably go too long on that procedure. Is it recommended to flush the coolant more frequently than what I've been doing?