MolaKule
Staff member
The first part has a good description of the physics of spectroscopy.
Article on Oil Analysis Interpretation
- Thread starter MolaKule
- Start date
- Status
Here is an article with a lot of good detail on oil analysis interpretation. It is in two parts, the first here:
http://www.autospeed.com/cms/article.html?&A=0912
and the second here:
http://www.autospeed.com/cms/article.html?&A=0919
http://www.autospeed.com/cms/article.html?&A=0912
and the second here:
http://www.autospeed.com/cms/article.html?&A=0919
We need to keep the following paragraph in mind (from part 1 of this article) when commenting on the used oil analysis results on this site
"Another point which must be emphasised is that trends are a better indicator than limits. Trends are established through regular sampling and analysis. By comparing the results of the latest sample against those of previous samples, it can be seen which readings have changed substantially from previous samples, and an appropriate diagnosis made accordingly. For example, in a differential, 300 ppm iron might be the norm for one type of operation, but on the same vehicle doing a different type of operation, and with a different period oil in use, 1500 ppm iron may well be acceptable. A pre-imposed limit of say 1000 ppm here would have excluded a perfectly good oil from further service."
Thus the holy grail of keeping iron under 10ppm and silicon under 10 ppm and lead under 10 ppm when looking at one sample is not always appropriate
[ March 03, 2003, 01:53 PM: Message edited by: Spector ]
"Another point which must be emphasised is that trends are a better indicator than limits. Trends are established through regular sampling and analysis. By comparing the results of the latest sample against those of previous samples, it can be seen which readings have changed substantially from previous samples, and an appropriate diagnosis made accordingly. For example, in a differential, 300 ppm iron might be the norm for one type of operation, but on the same vehicle doing a different type of operation, and with a different period oil in use, 1500 ppm iron may well be acceptable. A pre-imposed limit of say 1000 ppm here would have excluded a perfectly good oil from further service."
Thus the holy grail of keeping iron under 10ppm and silicon under 10 ppm and lead under 10 ppm when looking at one sample is not always appropriate
[ March 03, 2003, 01:53 PM: Message edited by: Spector ]
- Status
Similar threads
