Date: 16 Jun 1999 20:25:47 GMT From: saab85900nopsamcom (Saab85900) Subject: Re: Engine Oil
>I know that Amsoil and other quality synthetics can handle extended drain >intervals, but what concerns me is contaminants. The filter will catch the >larger >particulates, but what about acids and other crud too small for the filter to >catch? That's the only thing that keeps me from extending my drain intervals >past >5k miles. The AMSOIL recommendation is based on over 25 years of oil analysis on different kinds of cars and driving. No filter will catch acids, obviously. However, an oil sample can tell you if the oil is still adequately base to neutralize acids. AMSOIL gas engine oils start out with a base number of 11 or 12, so they can last a long time. When you do get water? Usually from condensation after cooling, right? And running at operating temperature lets the water go away as steam. So unless you do an awful lot of short haul driving, not heating the engine and oil (like 3 blocks to work and back<g>), you shouldn't have a problem. Dick in Falls Church, VA Using and selling AMSOIL (First in Synthetic) over 22 years
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