<VV> 25,000 mile oil change

[Mark Durham]

Ah, that is why you install the bypass filter, that keeps all those
extra contaminants out of the oil by trapping them in the filter, down
to 1 micron or less. Mark Durham.

On Fri, Mar 18, 2011 at 2:36 PM, Chris & Bill Strickland
<lechevrier at earthlink.net> wrote:
>
>>That thing about changing oil every year is for petroleum based mineral
>>oils. NOT synthetics.
>>
>
> We change engine oil, not because the lubricant wears out, but because
> it gets contaminated, and these days that may include becoming
> contaminated with ethanol, and where there's ethanol, there's water.
> And a stock Corvair does not have an ideal PVC system.
>
> Engines diesigned and built for the sixties don't magically quit
> contaminating the oil just because you change to a synthetic oil. Yes,
> it may reduce wear on critical engine parts, reducing the contamination,
> but not eliminating it.  Even Mobil 1, which used to claim extended oil
> change intervals of I believe 50,000 miles dropped that claim some time ago.
>
> Bill Strickland
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