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John Cooper wrote:
> In a message dated 3/21/01 9:09:46 PM Pacific Standard Time, 
> [EMAIL PROTECTED] writes:
> 
> > I first pull the oil dipstick out it measures 6 quarts 
> >  ... twist it 
> >  closed, then remove it again to read and it reads 5 quarts
> 
> The oil fill pipe enters the oil tank below the level of oil in the 
> tank.  
> This makes the fill pipe into a barometer.  When you run the engine. The

> fill 
> pipe gets a bubble of hot air in it.  As the engine cools oil is pulled 
> up 
> into the pipe.  When you open the cap, the level drops, but the stick 
> shows 
> the artificially high reading. 
> 
> Here's a test you could do, but it could be dangerous if you forget.  
> Fly the 
> plane.  Land, tie it down, then loosen the fill cap so the pipe is 
> exposed to 
> the atmosphere.  Go away for a couple of days.  Do not forget the cap is

> 
> loose and crank up the engine!  When you return, you should get an 
> accurate 
> oil reading first time.
> 
> John

This could only happen if the breather pipe is plugged. Otherwise there 
is atmospheric pressure in the sump.  Craig 2623H

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