wrote in message
...
On Thu, 10 Jun 2010 13:25:03 -0400, "Existential Angst"
wrote:

wrote in message
. ..
On Wed, 9 Jun 2010 20:50:40 -0400, "Existential Angst"
wrote:

"J Burns" wrote in message
...
jamesgangnc wrote:
On Jun 9, 3:24 pm, J Burns wrote:
A decal on my furnace blower seemed to say the motor was permanently
lubricated. The other day I got my head a little lower and saw a
second
decal saying it should be lubricated every couple of years with 20W
nondetergent oil.

I think 3-in-1 is like that, but I can't find my can. I did find a
4-ounce container of Marvel Lubricating Oil. Among the uses listed
on
the label is "small electric motors."

Small is relative. Would Marvel Lubricating Oil be good for a
furnace
blower?

I'd say it's a bit thin. My walmart has 30wt nondetergent. I'd
probably lean that way if I couldn't find 20wt. Nondetergent also
gets used in things like pressure washers.

Thanks, it looks as if you and Salty Dog are right.

One way to measure viscosity of motor oil is cSt at 40C. CSt is a
measure
of the number of seconds it takes a certain amount to drain through a
certain tube.

At 40C, the cSt of 10W should be 25-35
20W 40-80
30 80-120

I have a fresh can of 10W-30, a remnant of 30W nondetergent in a can I
bought last year, and a little 20W-50 in a can several years old. I
started with the 10W-30 because it's the freshest.


seconds at 25C
10W30 22
20W50 40
30W 47



If the 10W30 has a cSt about 30, the 20W-50 has a cSt of 55. So far,
so
good. The 30W ND seems to have a cSt of 64, like 20W oil. So maybe
that
brand of 30W could pass for 20W.

The Marvel Lubricating Oil? Three seconds!

Good show, very inneresting.

But simply shaking MMoil, or feeling it, tells you its too thin.
My jugs of it tout it as an additive. So you may be able to "cut" some
of
the oil you have, and use it in your motor, if the oil you have feels
too
thick. Or perform you cSt test on various mixtures..

REALLY bad advice.

Why?

It is not suitable for lubricating the bearings on an electric motor
of that size, or that use.

For openers, the flash point is only 128 degrees F.

That's right, dimwit. It's quite FLAMMABLE.

And what part of "mix" didn't you understand?

AND, you are an ignerint liar.

First, flash point has little to do with flammability of the liquid. Look
it up. You can have a very low flash point, and a very high ignition temp.

Second, MM oil is BARELY flammable, and won't sustain its own forced
combustion -- AT ALL.
How do I know? Cuz I just put some in the blue flame of my stove. Hot
enough for you?

Third, even if MM oil DID have a meaningful flashpoint, the quantities are
so small as to be insignficant, in an electric motor.
Fourth, did I mention MIX a little MM oil with other oils? Oh yeah, I did,
but you didn't understand that...

Fifth, go get a part-time job, help out yer mom a little.
--
EA