Re: Low Ash Oil?

Posted by andy r on June 10, 2006 at 08:57:29 from (69.66.148.45):

In Reply to: Low Ash Oil? posted by IaGary on June 10, 2006 at 07:21:46:

Low ash oil will not help your oil consumption. Here is what I have gathered about low ash oil. When the scraper oil ring on the piston wipes the oil from the cylinder wall on the downward stroke it still leaves a film of oil on the cylinder wall. This oil will burn when the gas/air mixture is ignited. If it is not low ash oil it tends to leave an ash like residue left from combustion. This residue creates the deposites on the valves, spark plugs and tops of the pistons. Eventually these deposites can grow and make a valve not close properly causing a burnt valve. Other deposites can flake off and get under a valve causing a burnt valve. I have a 706 that has drank oil also without any smoke. The problem has always been weak scraper oil rings. The engine always had good power as the compression and oil rings sealed things up good enough. It was just that the scrapers were worn out. Last time it just got new rings and bearings. The time before it got sleeves, rings and bearings. When they drink oil you have to keep hot plugs in them to keep them firing. Eventually they get so bad you can't keep oil in the crankcase.

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