I am not sure on the interval just due to the lower TBN it starts with vs. some of the other brands but I can vouch for the quality of the oil. I have used it in the 5W30 flavor (not the proDS, but I assume its the same as the previous with just a new name). It is a light 30w, so something to consider if your vehicle is prone to shearing oil. Has one of the higher Volatilities for synthetic at 13% as well although the 10w30 is around 9% I think. I am going to shoot for the 10w30 flavor this summer, should withstand the heat better. It is a good oil and I will continue to use it off and on based on sales. Just and FYI, AAP usually has deals on this from time to time for 19.99 with 5 quarts and a driveworks filter (which I don't use)but can upgrade most of the time to a pureone for 2 dollars more, 4 dollars a quart is tough to beat for this kind of quality oil.
