<VV> Oil Specs / Thinning in OUR Corvairs

[UltraMonzaWest at aol.com]

In a message dated 7/1/2005 2:56:30 PM Pacific Daylight Time, BobHelt at aol.com 
writes:

> Spec IIIGA requires that 
> the viscosity be checked every 10 hours during this 100 hour test and that 
> the 
> oil be compared to that of the new original oil, with both samples at 40 deg 
> 
> C. Note that a 100 hour test is the equivalent of 5000 miles at 50 mph. So 
> the 
> API is definitely concerned about viscosity increases of the oil during use, 
> 
> not viscosity decreases. If the API wen't concerned with viscosity increase, 
> 
> they wouldn't have included this into their spec. All GF-4 and SM oils MUST 
> meet this spec.
> 
> It is true that the SAE requires that a minimum viscosity of an oil at 150 
> deg C be met, but other than the thinning at the elevated temp, there is no 
> implication that the oil loses viscosity during use or that the viscosity 
> fails to 
> meet spec during use.
> 
> Thus we can know that it's not viscosity decreases we need to be concerned 
> with, but viscosity increases during use.
> 
> Regards,
> Bob Helt
> 
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I've found over the years....most "garage Queens", cars that are started 
often...driven seldom for any distance  suffer the GAS dilution of the oil.



Matt Nall / Patiomatt / WCUH / Chairman V V
69 Monza Cpe., 66 Monza vert, 65 Crown v8 Cpe.
Somewhere between Reno, NV and Coos Bay, Or.