Mobile Elite 222 is the replacement for Esso XD 3 in Canada. I have not purchased it for a while because the price was not compeditive with other good synthetics. The spring Mobile sale brought the price down to $5.95 a litre, which is very good for a premium synthetic oil in Canada. I purchased a case and noticed that on the box it came in it called the oil semi-synthetic. The bottle still calls it a full synthetic. I wrote to Mobile to ask which is correct but no answer. MY question is: Does anyone know what it really is. I believe it is full synthetic because it always has been but you never know what the manufactures are doing to save money. Thanks Roger