Posted by sotxbill on February 15, 2010 at 16:58:10 from (70.234.232.152):
In Reply to: Maybe OT Type of oil posted by Cockshutt Mike on February 14, 2010 at 21:47:12:
cummins had documented the seal problem.. in the late 70s silicon seals where becoming the fad and they found out the hd oils actually removed the silicon from the seals and the seals would prematurely harden and start leaking early. End result was that the seals where changes slightly and the problem went away. The hd detergents actually leached the silicon out of the seals. hd diesel oils are designed for a design use of 10,000 miles between oil changes with an engine life of a million miles... the oil is fortified so that if you miss a change, it will survive for 20,000 miles with out the thickening that light duties oils do. Although it carry more dirt with the detergents, the additive package should still keep acids under control. However remember that the more soot and dirt it carries, the higher the wear rate becomes. If your willing to do periodic oil analysis, you can safely extend oil changes, particularly on newer engines and light run engines, wear the oil analysis will also tell you the change oil sooner on older engines, or engines run very hard. Cummins also developed a special line of oil filters under its fleetguard brand name. some of the extended run filters have 3 types of filters, or even 4 filter sections... a conventional filter, a water/moisture asorbing filter, an centrifical section, and a small particle section. These filters extend engine life and oil filter changes. These filters are optional filters to regualar filters for some of the cummins engines.. like my fl3000 filter is a special part filter over the the standard filter. Its now superceeded by a newer filter.
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