Dear Seniors, I just bought an used E60 with 82k mileage. The previous owner never change the ATF oil before. last week I visited AB and have chat with SA and was told that it is not advisable to change the oil at this mileage if it was never change before. The reason given is the GB components/valves already adapted at the current oil viscosity and if we change new oil then it will cause issue to the fitting or sensor. Is this true and I believe we should change the oil as everything have their life frame. Looking forward to your advise...cheers