10. Bio-Fuel = Future Fuel
Europe:
Rape seed methyl ester
Typically B05
United State (US):
Soy bean methyl ester
Bio-diesel typically B20
Asia Pacific:
Palm oil methyl ester
Typically B05
11. Impact Bio-Fuel to
Lubricant
Impact of bio-diesel on:
engine cleanliness
potential consequences of fuel dilution
contamination of the engine oil
Droplet characteristics + lower volatility
+ spray pattern + wall impingement
non-combusted bio-diesel (past the
piston rings) fuel dilution
12. Oxidation
Unsaturated (particularly polyunsaturated fatty acid esters:
derived from corn, olive and sunflower oils) exhibit
poor oxidative stability
Un burnt bio-diesel entering the oil sump oxidized
lubricant degradation and thickening
13. Injector Fouling
Free fatty acids + water increased corrosion of the
injector system
Presence of glycerol + viscous glycerides contribute
injector coking
Higher quantities of bio-diesel increase injector fouling
(due to the thermo-oxidation and thermal polymerization
properties of unsaturated bio-diesel)
If injector tip deposits build up spray pattern disrupted
piston deposits increase ring-sticking and increase
fuel dilution
14. Wear and Corrosion
High level of fuel dilution
reduce the oil viscosity
lower oil film
thickness higher
friction higher wear
15. Oil Quality
Bio-diesel entering the oil
sump may undergo
oxidative polymerization
severe sludge
precipitation significant
loss of dispersancy /
antioxidancy increase
in piston deposits ring-
sticking