Man invents oil filter prefill tool

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I was taught to do oil changes with the oil cold after having let the engine run for at least 5 seconds so the cold thick oil is coated on the bearings, cam and everything else and that hot oil being very thin leaves a much thinner film behind so the engine can get damaged when there's no oil pressure. But I change the oil when cold more so out of comfort anyway. Never knew if it was true but it looks like it is but the difference in startup wear between hot and cold is most likely almost nothing once you add in the normal wear during the interval.

T

Post in thread 'Effects of start-stop tech on bearings = more wear'

50yr Street Mech said:
Engine is off, oil pressure goes to zero. Then re-start a minute later ??? It's like doing "dry starts" all the time IMO. Has to be added wear on bearings due to no oil pressure.
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The increase in wear isn't due to the lack of oil pressure. There's enough oil in the bearing to provide lubrication until the bearings get oil pressure again after a second or so.

The wear is due to the fact that hot oil is too thin to provide hydrodynamic lubrication at very low rotational speed, like when the engine first starts cranking, which results in some brief metal on metal contact.

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I didn't know there was a wrong way to pre-fill an oil filter. :LOL:
I stopped pre-filling my filters long time ago. I may start pre-filling them again since I use upside down cartridge filters and to pre-fill those it's piece of cake.
 
KGMtech said:
Well the only benefit of pre-filling a horizontal oil filter is to pre-wet the media, beyond that the mess starts. Far better to use the clear flood mode of pedal to floor before cranking to build oil pressure before starting.
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Like prefilling would work on a Cherokee or Wrangler with the 4.0 or 2.5 or any AMC with the 258.
 
Huskyguy68 said:
something to keep in mind when eating out at any restaurant is how often customers can catch Hepatitis A.......from Subway restaurants, Taco bell, you name it.

I recall (vaguely ) a News story I think from early 1990s. I live in Vancouver Canada and this happened in Seattle Washington, only a 3 hour or so drive across the border, so we get Seattle tv News channels, local Seattle news is easy to get a hold of.
Anyways, I think it was a Jack 'N the Box or something, hepatitis outbreak in Seattle.
Turned out the grill cook was coming to work sick with a poorly wrapped leaky fluid arm and cooking up the customer orders. He was tested for hepatitis and turned out to be the culprit. Something about he had no medical plan or medical insurance, could not afford it on the low minimum wage he got, so he kept showing up to work sick.....

Just Google '' hepatitis fast food worker infects'' and you might be there for a few days reading up on all the reported cases . And the Lawsuits.
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JavierH19 said:
I was taught to do oil changes with the oil cold after having let the engine run for at least 5 seconds so the cold thick oil is coated on the bearings, cam and everything else and that hot oil being very thin leaves a much thinner film behind so the engine can get damaged when there's no oil pressure. But I change the oil when cold more so out of comfort anyway. Never knew if it was true but it looks like it is but the difference in startup wear between hot and cold is most likely almost nothing once you add in the normal wear during the interval.

T

Post in thread 'Effects of start-stop tech on bearings = more wear'

50yr Street Mech said:
Engine is off, oil pressure goes to zero. Then re-start a minute later ??? It's like doing "dry starts" all the time IMO. Has to be added wear on bearings due to no oil pressure.
Click to expand...
The increase in wear isn't due to the lack of oil pressure. There's enough oil in the bearing to provide lubrication until the bearings get oil pressure again after a second or so.

The wear is due to the fact that hot oil is too thin to provide hydrodynamic lubrication at very low rotational speed, like when the engine first starts cranking, which results in some brief metal on metal contact.

Here's...
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Click to expand...
That “thick” cold oil on the bearings is only what remains from the “thin hot oil” that drained off of those bearings the last time the engine shut off. Only now it had MORE time to thoroughly drain off. Change it hot.
 
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