To sell OIL?

zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

So my decision at the moment is to change to a regular,
nothing-special-about-it, 10W-40 motor oil in the Spring.
I'll use a K&N oil filter, though I've never found them any better
or worse than any other oil filters.  Mobil-1 doesn't make the
filter for this car anymore.

Any suggestions for a good oil filter for this car while we're at it?
Anyone disagree with my ultimate conclusion about oil grade?

Someone suggested 20W-50 for the Summer.  Dealership told me
that'd be a bit on the thick side.  Moving to South Florida later in
the year, so is that an even better incentive to go to 20W-50?

   Not strictly a "fluid" in the technical sense.

   NOTE: That FLUIDS (and NOT solids as you gave an example) behave

Let's start here since notation doesn't transfer to non-binary groups.

http://scienceworld.wolfram.com/physics/NewtonsLawforFluids.html

http://en.wikipedia.org/wiki/Newton's_law_of_cooling#Newton.27s_law_of_cooling

http://www.engineeringtoolbox.com/compression-expansion-gases-d_605.html

If a compression or expansion takes place under constant temperature
conditions - the process is said to be isothermal. The isothermal process
can with the Ideal Gas Law be expressed as

p / ρ = constant         (1)

where

p = absolute pressure

ρ = density

http://www.answers.com/topic/thermal-expansion

physics) The dimensional changes exhibited by solids, liquids, and gases for
changes in temperature while pressure is held constant.

Most materials are subject to thermal expansion: a tendency to expand when
heated, and to contract when cooled. For this reason, bridges are built with
metal expansion joints, so that they can expand and contract without causing
faults in the overall structure of the bridge. Other machines and structures
likewise have built-in protection against the hazards of thermal expansion.
But thermal expansion can also be advantageous, making possible the workings
of thermometers and thermostats.

How It Works

Molecular Translational Energy

In scientific terms, heat is internal energy that flows from a system of
relatively high temperature to one at a relatively low temperature. The
internal energy itself, identified as thermal energy, is what people
commonly mean when they say "heat." A form of kinetic energy due to the
movement of molecules, thermal energy is sometimes called molecular
translational energy.

Temperature is defined as a measure of the average molecular translational
energy in a system, and the greater the temperature change for most
materials, as we shall see, the greater the amount of thermal expansion.
Thus, all these aspects of "heat"—heat itself (in the scientific sense), as
well as thermal energy, temperature, and thermal expansion—are ultimately
affected by the motion of molecules in relation to one another.

Molecular Motion and Newtonian Physics

In general, the kinetic energy created by molecular motion can be understood
within the framework of classical physics—that is, the paradigm associated
with Sir Isaac Newton (1642-1727) and his laws of motion. Newton was the
first to understand the physical force known as gravity, and he explained
the behavior of objects within the context of gravitational force. Among the
concepts essential to an understanding of Newtonian physics are the mass of
an object, its rate of motion (whether in terms of velocity or
acceleration), and the distance between objects. These, in turn, are all
components central to an understanding of how molecules in relative motion
generate thermal energy.

The greater the momentum of an object—that is, the product of its mass
multiplied by its rate of velocity—the greater the impact it has on another
object with which it collides. The greater, also, is its kinetic energy,
which is equal to one-half its mass multiplied by the square of its
velocity. The mass of a molecule, of course, is very small, yet if all the
molecules within an object are in relative motion—many of them colliding
and, thus, transferring kinetic energy—this is bound to lead to a relatively
large amount of thermal energy on the part of the larger object

Duhhh  that's what I said. The molecular CHAINING in multi-weight oils do
NOT change fluid properties, they alter only the TIME frame in which the
changes occur. In other words - when the fluid (in this case motor oil)
absorbs heat from the engine,  a 10 W. 30 weight oil will thin to equivalent
of a 10 weight oil in a longer span of time than a straight 30 weight would.
But when both fluids attain the destination temperature their viscosity will
be essentially the same as will their lubrication potential. The standard
test for lubrication potential of motor oils has been for many decades to
heat them to a specific temperature akin to the operating temperature of a
motor oil in an average internal combustion engine. Then to apply pressure
to bearings on a rotating shaft to determine at what point the oil loses its
lubrication potential. Texaco for some years was running a TV ad comparing
their Havoline 10 W 30 against other oil companies 10 w 30. My argument with
the refinery engineer was along the lines that I thought Havoline straight
30 weight would actually perform better than the multi-grade. He said that
they had never compared it to our own oils. He then performed the tests in
the Texaco labs. He bought me the steak dinner.

   That was before 10 W 40 and 10 W 50 came around and later 20 W 50. Long
before synthetics which has a very improved lubrication potential. Recently
Castrol's Edge deposed Mobil 1 as the champ.
By a remarkable degree. I am sure that Mobil won't take that sitting down.