Just read, that oil, should be changed , before storing the vehicle, in this case my C8. The reason, used oil has moisture in it and if the vehicle is sitting for a long period of time, the moisture corodes the engine parts. So I will be using my first in November, hopefully the same day as storage. Also new synthetic oil, sitting in, anything, lasts up to 7 years, without losing its efficiency. By what I read here, I must tell them to not change DCT oil, until I reach 12000kms and not during the first oil change.