I just changed the oil on my Z150 and followed all the instructions found here on MTBR and feel I did it right. I set the oil height at 45mm below top of stanchions and used Torco 5w. I got 5 good inches of travel and it feels like it is bottoming out there and does not get that 6th inch. No air preload. I then lowered the height to 65mm below the top and got the same results. Should I try 3w oil and/or lower the oil height even more. How low can you set the oil height and how thin of an oil can be used? The fork acted like this when I bought it and I attributed it to a long break in period because it eventually achieved full travel after ~6weeks of riding. Did it take 6weeks of oil use/loss to get to a low enough height so that it could get full travel? Any tips would be grately appreciated.