View single post by Si.
 Posted: Mon Apr 10th, 2017 09:18 am
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Joined: Thu Feb 23rd, 2012
Location: London
Posts: 5954
A simple test performed by a Member of an automotive & electrical Forum I sometimes look at :-

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Electrical Conductivity of oil: myth de-bunked

One of the distinguished members of this group asserted a claim that oil is conductive. Always having held the belief that it was insulative I decided to test the distinguished members theory.

My belief was based on anecdotal evidence based on observations I have made over the years, ie... ignition coils are filled with oil, diodes in oil cooled alternators are immersed in oil and solenoids in electronic controlled transmissions are immersed in oil with no ill effects to the electric system.

Using controlled conditions I assembled together a digital volt/ohm/ammeter, a sample of engine oil, transmission oil and water and an automotive battery.

The three test liquids were put in paper cups. I tested for continuity in the three samples with the ohmmeter starting with the lowest setting and progressively switching to the highest most sensitive settings.

Result: water passes current at some of the higher resistance settings while the 2 two respective oil samples did not have any continuity, even when the meter was on its most sensitive setting.

Test two revolved around using the three samples and attempting to pass current thru them from the automotive battery while measuring current with an ammeter set on it's most sensitive scale.

the expected result was obtained: electricity will flow thru water, the oil samples did not allow any measurable current to flow.

I came up with two conclusions based on this test.

1. Oil is in fact an INSULATOR.

2. I have too much time on my hands.


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