T&T: Lubrication Theory and Practice

[Mike Maurice]

These are 3 articles that cover much of our debates on oil. A few things 
gleaned from them.

1. Off road diesel contains high levels of sulphur. A different oil than 
used for on road, formulated to cope with this would be desirable. Low 
sulfur off road diesel may be the norm by this summer. Marine users 
generally have access only to off road diesel.

2. High oil consumption is not normal and is caused by factors which 
contribute to an ever worsening set of conditions, blowby and crankcase 
oil contamination. Such a situation needs immediate attention.

3. Oil consists of lubricant and additives. The lubricant keeps the 
metal apart. The additives don't keep the metal apart. Recent additives 
packages CH, CI, CJ may be very bad for older engines, for which they 
were not intended.

4. It may be, but might not, that some owners who are experiencing high 
oil consumption have gotten there unwittingly by using oils with recent 
additive packages.

5. My reaction to all this is that I would NOT routinely use a 
multi-weight oil, except maybe a synthetic. That I would stick with 
single weight oils. All this applies to engines prior to about 2002.

6. That for engines since about 2002, I would stick right to the API 
class of oil recommended by the engine manufacturer.

There is plenty to read and learn from.




http://www.lubrizol.com/LubeTheory/adduse.asp


http://www.exxonmobil.com/Canada-English/Marine/PDS/IOCAENMRNMOMobilgard_ADL_Series.asp


http://www.practicingoilanalysis.com/article_detail.asp?articleid=562&relatedbookgroup=OilAnalysis




Mike
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Capt. Mike Maurice
Beaverton Oregon(Near Portland)