FUEL OIL CONTAINS SULPHUR WHICH REACTS WITH WATER WHILE BURNING INSIDE THE CYLINDER TO FROM H2SO4. THIS H2SO4 CAUSES COLD CORROSION, WHICH LEAD TO LINER WEAR.
TO COUNTERACT IT THE CYLINDER OIL OF HIGH TBN IS GENERALLY USED. BUT WHEN WE CHANGE OVER TO LOW SULPHUR FUEL WE ALSO CHANGE THE CYLINDER OIL TO LOW TBN CYLINDER OIL. THIS IS BECAUSE IF WE USE HIGH TBN OIL WITH LOW SULPHUR OIL, ONLY SOME PART OF ALKALINE COMPOUND PRESENT IN THE LUBE OIL WILL BE USED TO REACT AND NEUTRALIZE THE ACID FORMED WHILE THE REMAINING ONE WE CAUSE LACQUERING. ALSO READ Cylinder Liner Honing and Lacquering