SF was from 1980 to 1988, SG from 1988 to 1994.
Levels of additives in SF are real, real, low. SG was an imporvement and SH a jump. Believe it or not, there are still a lot of companies that sell SF.
PDV (who owns Citgo) claims that there is no reason to put SL or SH, or even SG in a 1987 engine, nor SL in anything older than 2002. That it is overkill, and you shouldn't really put that much protection in those engines. One of their arguments is that it met the warrantee requirements - I like to point out that the warrantees were only 24,000 miles in those days. They make a killing on junk.
There are U.S. Blenders who still blend SF/CD for anyone who wants it, and a lot is exported. I just recently saw drums of CC from the U.S. for every con man there is a game, and for every buyer a seller or manufacturer.
You buy a new Mitsubishi in the U.S. today and I think the warrantee is 120,000 miles or more, with the requirement that you use SL oil. You buy the same car with the same engine here, the manual says you can use SF, but the warrantee is only 30,000 miles.