Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
One aspect however where the lubricating oil can contribute, is by minimizing the formation of lubricating oil related deposits, e.g. ash and oil coke.
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In order to check the performance of the candidate oils, Shell executed boroscopic inspections at the end of the running period on each of the oils tested. The pictures in figures 7, 8 and 9 provide a representative impression of the condition of the combustion chamber after 3670 running hours on Oil E. Cylinder heads had been newly installed just before starting with Oil E, whereas pistons and liners had collected 6640 running hours at the time of this “no harm” type of inspection.
Figure 7. Condition of cylinder liners 6640 rh after overhaul and 3670 rh with Oil E The inspection shows that liners are in excellent condition with hardly any wear of the honing pattern. In just a few liners, scratches were seen that were caused by hard SiO2 particles. The good condition is also confirmed by the low and stable oil consumption of the engine.
Figure 9. Condition of piston crowns 6640 rh after overhaul and 3670 rh with Oil E.
Conclusions
Based on the work presented in this paper, Shell commercialised candidate Oil E and introduced it into the market as Shell Mysella S5 S some months ago. With this product in the portfolio, Shell Lubricants can offer their customers long oil drain intervals in engines running on biogas in the following way:
• By offering Shell Mysella S3 S for installations running on highly acidic fuel gas.
Shell Mysella S3 S provides high acid neutralization capacity through durable BN. • By offering Shell Mysella S5 S for less acidic biogases, providing very long oil drain intervals thanks to high oxidation resistance and sufficient amount of durable BN.
In addition, Shell Mysella S5S offers good engine protection because:
Figure 8. Condition of cylinder heads after 3670 rh with Oil E Deposits in the combustion chamber were well under control, the ash layers were relatively thin, and no evidence was found of large pieces of solid material broken out of the deposit layer. This has to be judged in correlation with the moderate level of siloxanes in the fuel (ref appendix 1).
• It has a low ash content, reducing the contribution of lube oil to combustion chamber deposits.
• It is an advanced additive formulation in Group II base oils, which helps to further minimize ash and carbon deposits.
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