It is better to change the oil initially, so that you do not have to change the battery later =) Just a lot of people have difficulties with the selection of oil and here, of course, it is better to immediately contact a specialist or read the relevant articles to choose exactly the right oil, which is necessary. For example I am very glad that I was able to find information about it, for example you can also study if you need about best oil for cummins 6.7 https://carfluidsexpert.com/best-oil-for-cummins-6-7/ . I’m very glad I found it, here you can pick up this or that position. I hope I was able to help someone else with the selection.