rt138Jl. Kramat Bunder No.7, RT.14RW.1, Kramat, Kec. Senen, Kota Jakarta Pusat, Daerah Khusus Ibukota Jakarta 10450, IndonesiaDATA & SPECIFICATIONS RT-138 Issue 1, Page 11 13 Cylinder oils of excessively hh BN for the fuel sulphur can lead to excessive piston crown deposit accumulation. Piston crown deposits need to be carefully monitored