My local Autozone had a ton of MOBIL Delvac 1300 15/40 CI4+ so I bought 9 gallons... That should get me to synthetic time... Went back 2 hours later for something else and they were ALLLLL GONE!!!!
not sure why you guys are going off the deep end on the synthetic... a number of manufacturers will continue to make CI-4+ till 2010.
also realize that just because a conventional is CI-4, it's not CI-4+