I saw a video by Lake Speed Jr talking about additives in oils. He seemed to indicate that calcium levels over 1500ppm were not good for DI engines. My 14 MB E350 is DI and spent it's 72k life on M1 0-40 or dealer 5-40 oils. The 0-40 shows 3pk ppm of calcium while the QS Euro 5-40 shows 1500ppm. Would it be wise to switch to the QS 5-40 229.5 oil for the future? Engine runs fine at present. I've been using QS 5-40 in my other MB 3.5 DI.