rt138Hati Hati Terhadap Situs Phising & Scam ! Gunakan Selalu Link Resmi RT138 , Akses Login Mudah Tanpa Kendala , Link Anti Internet Positif RT138.DATA & 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