SL2023-737/NHN CyIinder lubrication update for operation on ULSFO, VLSFO, biofuel, LNG, LEG, LPG, methanol, and HSFO

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CyIinder lubrication update for operation on ULSFO, VLSFO, biofuel, LNG, LEG, LPG, methanol, and HSFO
SL2023-737/NHN June 2023 (replaces SL2014-587/JAP and SL2019-671/JAP)
Concerns
Owners and operators of MAN B&W two-stroke marine diesel engines.
Type: ME/ME-C/ME-B/MC/MC-C/ ME-GI/ME-GIE/ME-LGIM/ME-LGIP and ME-GA engines

Summary
− Monitor cylinder condition
− Analyse scavenge drain oil
− Ensure clean and free piston rings
− Cat. II cylinder oils for optimal cleaning ability
− Use BN 100 oils or higher for engines showing signs of corrosion

File Name:	sl2023-737-CyIinder lubrication update.pdf
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Last Updated Date:	13-04-2025
Document history:	General guidance Mark 9 and higher, and all dual-fuel engines: − 0–0.50% S fuel: Cat. II BN 40 ME-GI (pilot fuel 0–0.50% S): Cat. II BN 40 − HSFO >0.5% S: Cat. II BN 100–140+Mark 8 and lower: − 0–0.50% S fuel: min. Cat. I BN 40 − HSFO >0.5% S: Cat. I BN 70 or Cat. II BN 100–140+References to other Service Letters SL2014-587, SL2019-670, SL2019-685, SL2022-728, and SL2023-738/IKCA.