rt138Crossing Sainte-Anne-de-la-Pérade (Chemin du Roy). Route 138 is a major hhway in the Canadian province of Quebec, following the entire north shore of the St. Lawrence River pastDATA & 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