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Popular Diesel Engine Specs

Detroit Diesel Oil analysis meanings and recommendations

Oil Recommendations for 2-stroke and 4-stroke Detroit Diesel engines:


Temperature Range

These recommendations apply within the normal ambient temperature range. For extreme cold, that is at temperatures below -32°C (-25°F), the oil recommendations change. - Consult your oil supplier for further advice.

OIL: For Detroit Diesel 2-Stroke Engines

Use SAE 40 Mono grade oil

OIL: For Detroit Diesel 4-Stroke Engines

Use 15W-40 multigrade oil.
There are no sulphated ash limits imposed for Detroit Diesel 4-cycle engines.

Changing oil & filters:

New Engines or newly overhauled engines:
first oil & filter change:
After 50 hours operation

Change oil every 150 hours
Change filters every 450 hours

Elements allowed in oil of Detroit Diesel 2-stroke engines

Normal and max levels of
alowable Elements in oil for
Detroit Diesel 2 stroke engines

Chromium  normal 15  	max 20
Copper  	 normal 15  	max 25
Iron   	 normal 65  	max 150
Lead   	 normal 20  	max 25
Silicon  	 normal 35  	max 40
Sodium   	 normal 0
Tin    	 normal 30  	max 40

Excess levels of alowable Elements 
in oil of Detroit Diesel 2 stroke engines
indicates problems with:

Chromium  rings
Copper  	 Bushings, bearings, thrust washers
Iron   	 Liners, gears, camshafts
Lead   	 Bearing overlay material
Silicon  	 Dust, air leaks
Sodium   	 Internal water leaks
Tin    	 Piston plating

Trace elements in engine oil

Trace elements found by oil analysis in Detroit Diesel 2-stroke engines, are in some cases quite different from the normal ranges of elements found in 4-stroke cycle engines, therefore special mention of the 2-stroke ranges is made here.

Barrington Diesel Club
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Page Revision #21.3R 02-18