https://www.yahoo.com/movies/before-they-were-transformers-meet-the-early-japanese-89777222787.html G1 Grimlock could blow flames?
The article clearly states the fire-breathing Grimlock was just for a commercial. It's actually quite well-informed, but I don't recall Battle Convoy having a sword, but I could just not know of it.
Yes, the children's toy spat real fire. Kids today are pussies and just couldnt handle that kind of cool. See also: lawn darts.
The article implies that the Diaclone toys that would later become Transformers were available in Japan in 1980. That was the year when the Diaclone line itself was launched, but the first Car Robot toy, Sunstreaker's Diaclone predecessor, was released in 1982.
I was shown this earlier today and had to admit I allowed myself a smile that Diaclone has made its way into a mainstream article All the best Maz