Trunk oil is a lubricant for medium-speed four-stroke trunk-piston engines operating on high-sulphur residual fuel. Grades: 30, 40. Its published base number is 30 mg KOH/g. For low-sulphur distillate fuel, see Special trunk oil.
Grades & published data
Typical values from the product data sheet, each with its test method.
Overview
Trunk oil is a lubricant for medium-speed four-stroke trunk-piston engines operating on high-sulphur residual fuel. Grades: 30, 40. Its published base number is 30 mg KOH/g. For low-sulphur distillate fuel, see Special trunk oil.
In marine and stationary diesel service, the base number is matched to the sulphur content of the fuel: higher-sulphur fuels need a higher base number to neutralise the acids formed in combustion. The specification table lists each grade with its test methods.
Application
Medium-speed engines burning high-sulphur heavy fuel oil.
Feature
30: KV100 12 cSt, VI 95, TBN 30 mg KOH/g, pour point -18 °C; 40: KV100 15.5 cSt, VI 95, TBN 30 mg KOH/g, pour point -12 °C.
By the sulphur content of the fuel and the engine maker's guidance. Share your fuel analysis and engine model and we will confirm the right product.
Next step
The range above is what we publish. Formulation to a customer brief is a route of its own, and a sample is the first stage of it.
