The problem with three in one is that it dries up, and gets sticky. I've had
that happen on fans. Yes, I'd try a couple drops of ND-20 or ND-30. Won't
flush the three in one out, but might help.

About 1990 or so, long before I got my start in the HVAC trade. The blower
on my furnace started howling. It was bedtime, and I didn't think I wanted
to call HVAC tech, figured it would be expensive. Found the oil ports for
the motor, and forced in some oil that I had. I think I used 10w30, which is
the wrong stuff. But, it got me by for a while. Now, I've got the "right
oil" available.

Christopher A. Young
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..

"Ed" wrote in message ...
With today being very cold and the furnace about to run a lot, I realized
that
the electric motor that runs the burner in my oil furnace hadn't been oiled
in
a year. I remember in years past having asked the furnace-maintenance guy if
it was okay to use 3-in-1 Multipurpose Household oil in the burner's oil
cup.
He'd said it was okay. So that's what I put in, about 8 drops. (The can must
be 10 years old so any volatile ingredients might have evaporated.)

Then I did some online research and have read that is not okay to use that.
So
I went to Lowes and got 3-in-1 Motor Oil SAE 20. Can I put that in to flush
out the Household oil with the penetrant that's in the Household oil? Is
this
a big problem, or am I worried for nothing?

Is it possible to put too much oil into that hole for the oil cup and cause
damage somehow?