Posted by mattofvinings on March 14, 2009 at 08:12:54 from (24.178.75.169):
In Reply to: low ash oil posted by CliffordPaul on March 14, 2009 at 07:47:26:
I've often wondered about this too..I've gotta believe the latest API-SM service oils (basically name brand engine oils from an auto-parts store) are light-years ahead of what the engines were originally designed to run on.
One issue, though is the amount of oil consumption...thru valve stems and past oil-control rings on the pistons. These engines are also "looser" in that respect than a modern vehicle engine IMHO. My belief is that the "low ash" feature has to do with what happens to the oil when it is burned in the combustion chamber.
Although there are also sensitive components in modern engines (O2 sensors, EGR valves, PCV systems, cat converters) that can't afford to be "poisoned" by a reasonable amount of oil consumption (and thus oil-combustion) either.
So..the mystery continues...
This post was edited by mattofvinings at 08:14:12 03/14/09.
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