Hi, I have BMW f10 525d 2013 make with 65k KM on it, I have done engine oil change diy for the first time, I brought 5.5 ltrs of Castrol Edge 5-W-40 for it. I have two queries regarding oil change I did. The Castrol jugs that I brought were of BMW long-lige-01 spec, but I have heard that BMW recommends long-life-04 spec oil for diesel engine cars, but the problem is that no long-life-04 spec engine oil is available in my city should I be worried running non-DPF oil in Diesel BMW 525? The second query is that I brought three jugs of Castrol Edge 5-W-40, one of 3.5 ltr and two of 1 ltrs (since no packing of 5.25 ltrs was available) 3.5 ltr jug was labeled "5W40 A3/B4" and 2x 1 ltrs was labeled "5W40 SN" are A3/B4 & SN same thing? anything else you guys would like to recommend to a newbie that should be kept in mind while doing an oil change?