CI-4+ oil is available every where and will be for a long time. before the pdf came out they had to stop selling the ci4 oil in quarts,gallons and 2. 5 gallon containers. you can only get it in 5 gallon and 55 gallon sizes. it is less expensive than the cj-4. we use dello. the containers are marked with LE by the 15w-40 for the cj-4