Posted by Owen Aaland on May 13, 2008 at 17:20:27 from (65.165.246.39):
In Reply to: Non-detergent oil posted by dhermesc on May 13, 2008 at 05:51:09:
dhermesc said: (quoted from post at 05:51:09 05/13/08) "If you want the 'champaign' of oil, use detergent oil rated for diesel engines...its just a higher quality oil, can be used in anything."
Actually that is far from accurate. Diesel rated oils usually have much higher sulfated ash content then gasoline engine oils have.
According to Cat the ideal deisel oil will have a sulfated ash content ranging from 1.3% to 1.5%. For gas engines the lower the sulfated ash content the better (that's why IH advertised their gas engine oil as "Low Ash"). As the list shows synthetics have no ash content and the "super premium" conventional oils have and ash content of less than 1%.
The high ash content of diesel oils was there to neutralize the sulfur that is in the fuel. When the sulfur gets into the crankcase from blow by when the fuel is burned it mixes with water/condensation to form sulfuric acid that attacks the bearings. With the advent of ultra low sulfur diesel should be less need for the ash content. International ran into problems with the high ash content when used in the last series of gas engines because the ash would be turned to carbon deposits on the exhaust valve stems causing them to stick in the guide when they got hot. The slightly open valve would quickly burn out. The low ash content for gas engines came about as a solution to this problems. The older engines as used in the M,s do not suffer from this problem.
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