Mixing Different Marine Engine Oils: Reluctant Use and Compatability
http://papers.sae.org/961095/
Originally Posted By: precis
In engine maintenance there may be ocassions when due to some weighty reasons a change of the lubricant brand becomes nesessary. It is simply executed in small automotive type engines where a full oil charge can be poured off for the new one. However, in large marine engines containing much more oil charge which operate longer without change (many thousand hours) a similar procedure will be extremely expensive if the oil has not achieved it's quality(or performance) limit. For the most part it is done by gradual topping up one fresh oil to another oil in use. Are there any harmful effects on the engine and oil condition in that case?This paper presents experiments and test results utilizing different marine engine oils mixtures. The effect of some operational and external factors on the mixed oil properties as well as the study of oil incompatibility mechanisms have been investigated. Practical recommendations for technical service person have also been made.
I've only got access to the preview pages, haven't paid for it (yet, or ever, not sure yet).
Introduction introduces the "nothing blows up" principal of mixing fresh and fresh different oils.
Discussion on the nature of the dispersents used to handle soot loading and the introduction of an "incompatibility" ranking of soot dispersion, by basically developing a representation of the change in distribution of particle sizes when new oil with a different dispersent is introduced to a used oil...1 means no change, and "compatible"...numbers further away from 1 are the degree of incompatibility.
Table showing the TBN of virgin oils and those virgin oils mixed (interesting). And TBN drop in service of the mixes.
Lastly a few results and a little discussion on the differences between running a blend and topping up mid OCI with a different oil
YES it's old, is diesels, and marine diesels.
http://papers.sae.org/961095/
Originally Posted By: precis
In engine maintenance there may be ocassions when due to some weighty reasons a change of the lubricant brand becomes nesessary. It is simply executed in small automotive type engines where a full oil charge can be poured off for the new one. However, in large marine engines containing much more oil charge which operate longer without change (many thousand hours) a similar procedure will be extremely expensive if the oil has not achieved it's quality(or performance) limit. For the most part it is done by gradual topping up one fresh oil to another oil in use. Are there any harmful effects on the engine and oil condition in that case?This paper presents experiments and test results utilizing different marine engine oils mixtures. The effect of some operational and external factors on the mixed oil properties as well as the study of oil incompatibility mechanisms have been investigated. Practical recommendations for technical service person have also been made.
I've only got access to the preview pages, haven't paid for it (yet, or ever, not sure yet).
Introduction introduces the "nothing blows up" principal of mixing fresh and fresh different oils.
Discussion on the nature of the dispersents used to handle soot loading and the introduction of an "incompatibility" ranking of soot dispersion, by basically developing a representation of the change in distribution of particle sizes when new oil with a different dispersent is introduced to a used oil...1 means no change, and "compatible"...numbers further away from 1 are the degree of incompatibility.
Table showing the TBN of virgin oils and those virgin oils mixed (interesting). And TBN drop in service of the mixes.
Lastly a few results and a little discussion on the differences between running a blend and topping up mid OCI with a different oil
YES it's old, is diesels, and marine diesels.