An oily question

[dardal@xxxxxxxxxxxxxxx]

yes, this is indeed a "greasy" question ;)

All oils go thinner when they get hot.  A 10w30 oil will have the viscocity of 
a 10w oil when cold.  When hot however, the viscocity will not drop as rapidly 
as a 10w oil.  Istead, at 210F, it will maintain viscocity similar to a 30 w 
oil AT THAT temperature.  The oil is still thinner than room temperature.

There have been numerous discussion on synthetics.  Look at the archieves.

D^2

Quoting Daniel M Wing <imp1983@xxxxxxxx>:

> Hi,
> 
> I have an oil question, and you can reply privately if you want.
> 
> I know that 30w oil is recommended by most for an older engine,
> and race engines use it too.
> 
> But, what is not so good about using multi- viscosity oil?
> 
> Isn't it supposed to change with the temperature?  When the
> engine is cold, it is thinner so that it is easier to start and get it
> pumping.  But, when it's hot, doesn't the viscosity go up, making
> it in effect 'thicker'?  (Try starting your car at -10 degrees F and
> tell me 30w is better.)
> 
> Also, I have always thought that synthetic oils are supposed to be
> far superior to other oils, because it doesn't break down as fast, 
> and it clings to the engine parts longer, providing better lubrication
> at initial startup.  Or, is this a bunch of hype?
> 
> Just curious.  No oil wars please (unless in the mid east).
> 
> Dan Wing
> Marcy, NY  USA
> 
> imp1983@xxxxxxxx
> 
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