rt138Rt-138_a1 Lubricating Oils Data & Specifications - Free download as PDF File (.pdf), Text File (.txt) or read on for free. 1. The document lists validated lubricating oils for cylinderDATA & 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