I went all in, I just finished a ~950 mile Kreen flush after replacing the valve cover and spark plug tube gaskets, and dumped in 4.5 quarts of Amsoil SS 10W30 and an FU 7317 filter. The light tapping valvetrain noises that were present on the Rotella Gas Truck 5W30 seem to be quieted to the point of inaudibility, so far so good. Plan is to pull a dipstick tube sample at 10k (provided that consumption does not create the need to add oil) and gauge what to do with it at that point.
I'm hoping the ~4% NOACK and a nice and Kreen (
) engine help keep the level full; the engine did not consume anything prior but there is only ~3500 miles of personal history with this vehicle so time will tell. I've been tracking everything with Fuelly since I bought the car, and have been hovering right around the 28.8-28.9mpg/tank with a high of 30.9 mpg when I drove to Cincy, so the warm weather will slightly skew things in favor of the Amsoil. However, the long-term trends should be interesting with the Amsoil.
That is one nice thing about the 2000's Subarus... they all had a 16-gallon tank, and roughly 25-28mpg, so each quarter tank is roughly 100 miles traveled, so you can mentally guesstimate if mileage is up or down, and remaining distance to empty
I'm hoping the ~4% NOACK and a nice and Kreen (
That is one nice thing about the 2000's Subarus... they all had a 16-gallon tank, and roughly 25-28mpg, so each quarter tank is roughly 100 miles traveled, so you can mentally guesstimate if mileage is up or down, and remaining distance to empty