Isn't multi-grade oil the cold weight with additives to make
it work differently when hot? In other words, 10W-30 is SAE
10 weight oil that acts like SAE 30 when hot.
Seems like any additives would break down over time, and it
would revert to 10 weight oil if you left it in too long.
Every owner's manual I've ever seen links oil to climate
conditions. If you're in a mild area single weights are
great; for most of us with varying climates we need the
cold-start advantage of multi-grade.
--Roger van Hoy, '55DeSoto, '42DeSoto, '66Plymouth,
'73Duster, '81 Imperial, Washougal, WA
----- Original Message -----
From: <TheCarNutz@xxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Friday, January 11, 2002 9:58 PM
Subject: Re: IML: Single & Multiple Viscosity Oil
| In a message dated 1/11/02 1:03:36 PM Pacific Standard
Time,
| dardal@xxxxxxxxxxxxxxx writes:
|
| > I doubt it will make much difference now, but you should
avoid using single
| > weight oils. A 10w30 or 20w40 is much better than 30w
or 40w. Even if
| the
| > car was built at a time when these oils were
recommended, the times have
| > changed and the oils are so much better now...
| > D^2
| I'm a bit puzzled when someone makes a statement, as if
there is a "chemical"
| difference between single weight and multiple viscosity
oils. If you look at
| the top of the can and the ratings are the same for both,
the only difference
| is in cold weather climates you should use multiple
viscosity oils in the
| winter, since when cold they are the 10w as in 10w30, and
when warmed up are
| the 30 as in 10w30. In otherwords, thin to provide proper
lubrication when
| cold, and thicker after warmup. If you lived in a desert
climate as I and
| some other list members, use of single 30 or 40W viscosity
oil in the summer
| is quite common due to the intense heat. The quality of
the oil is the same
| in both cases.
| Bill B.
|
|
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