I am at 9% when I checked the other day and around the 6k mark on this oil. I only have 14k on car and only changed twice so far. Dealer service department recommended 3k on first change and I used the DIC for the second and changed at 2% or 3% and had something like 5500 on that change. I use Mobil 1 and will changed it myself when it tells me to, 7500 miles or 12 months whichever comes first. I drive it daily for work through rain, sleet and snow. I only put on roughly 10k to 12k per year on a vehicle.
Dean.
