I found a supply of Delo 400 CI-4. First I checked around and only came up with CJ-4 oils. I then tried an oil distributer. I was told they carry four types of oil. Only Chevron is going to make both types for now. Only problem they are not going ship CI-4 in card board. Meaning you will not see 1qt or 1gal sizes. I had to buy it in 5 gal pales. Asked if they would fill my 55 1gal milk jugs but no luck. :-laf The company in Portland OR is Carson Oil Company. You may check around and find a large oil company that will sell CI-4 . It may or may not be the brand you have been using. I payed $49 for a 5 gal pale.