Estimate two-stroke marine cylinder oil consumption from engine
power, load, operating hours and user-entered feed rate. Calculate
daily and annual oil use, liters, drums, lubricant cost, cost per
MWh, cylinder-oil-to-fuel ratio and onboard ROB endurance. Advanced
mode models multiple engine-load periods with different feed rates.
Currency is display only. No exchange-rate conversion is performed.
Consumption
Feed rate × engine energy output
Operating Cost
Daily, annual, per-hour and per-MWh lubricant economics
ROB Planning
Onboard endurance, reserve and entered resupply lead-time coverage
Engine & Operating Profile
Use the engine's applicable rated power and a representative
operating load. The tool does not recommend a cylinder-oil feed rate.
kW / engine
engines
% MCR
hours/day
days/year
knots
Optional. Used for cylinder-oil consumption per 1,000 nautical miles.
Cylinder Oil & Fuel Inputs
g/kWh
$
/MT
kg/L
liters
g/kWh
Used only to estimate cylinder oil as a percentage of modeled
main-engine fuel mass.
Onboard ROB & Resupply Planning
MT
MT
days
Engine & Annual Assumptions
Advanced mode calculates each load period separately and aggregates
the representative daily profile.
kW / engine
engines
days/year
$
/MT
kg/L
liters
g/kWh
Daily Load & Feed-Rate Profile
Enter the approved or observed feed rate for each operating condition.
Hours are summed as one representative operating day.
Operating Mode
Load % MCR
Hours / Day
Feed Rate g/kWh
Onboard ROB & Resupply Planning
MT
MT
days
Cylinder Oil Results
Single-load operating estimate
Enter engine data
Enter engine power, operating load and cylinder-oil feed rate to
estimate daily and annual lubricant consumption.
Annual Cylinder Oil Requirement
N/A
Representative daily consumption × entered operating days
Annual Cylinder Oil Cost
N/A
Based on the entered cylinder-oil price
Daily Cylinder Oil
N/A
Daily Volume
N/A
Weighted Feed Rate
N/A
Average Engine Load
N/A
Running Hours / Year
N/A
Cylinder Oil Cost / Day
N/A
Cost / Running Hour
N/A
Cost / MWh
N/A
Cyl. Oil / Engine Fuel
N/A
Annual Containers
N/A
Current ROB Endurance
N/A
Usable ROB Endurance
N/A
Lead-Time + Reserve ROB
N/A
ROB Surplus / Shortfall
N/A
Load-Period Consumption
Advanced mode
Mode
Load
Hours
Feed
Energy
Cyl. Oil
Daily Cost
Annual Cylinder Oil Cost Breakdown
ROB & Resupply Planning
Cylinder Oil Summary
Annual Cost Sensitivity
Feed rate vs oil price
Feed Rate \ Price
-20%
Base
+20%
Model approach:
cylinder oil mass equals engine output energy × user-entered
feed rate. Daily engine energy is rated power × engine count ×
load fraction × operating hours. Advanced mode calculates each
load period separately and derives an energy-weighted average
feed rate. If main-engine SFOC is entered, the tool also estimates
cylinder oil as a percentage of modeled fuel mass. ROB planning
compares current onboard stock with consumption during the entered
resupply lead time plus the entered minimum reserve.
Planning estimate only.
Cylinder oil feed rate is engine-, liner-, ring-, fuel- and
operating-condition-specific. Actual requirements depend on engine
maker instructions, engine design, fuel sulfur content, cylinder oil
BN, liner condition, scrape-down analysis, cold-corrosion risk, load
profile, lubrication-control strategy and vessel procedures. This
tool does not recommend lowering or increasing feed rate and must
not override OEM limits, approved lubrication settings or
condition-monitoring results. Use vessel-specific engine documentation
and technical guidance before changing cylinder lubrication practice.
