Oil Extractor - Good or Bad Idea?

Because draining your oil through the drain plug consumes more gravity. It may not seem like a big deal now, but when we start using up all of our precious gravity resources doing things like draining oil, you're going to feel like a real ass hole.

 

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I kind of feel like using the extraction method is comparable to changing the oil and not the filter..... Which I don't believe in doing. if your going to do an oil change, do it right. Not saying this way isnt exactly right, but the draining of the oil I feel would get more small particles moving than the force of suction thru a small hole. If you change the oil regularly this is ok, but would recomend a full drain every now and then.

But it is a cool tool that I have never thought to check out.

 

And yeah, I hear you about not wasting the gravity , there are better things to use it for.

 

Save the gravity.

 

But, like i said in my earlier post on this thread, i'd like to extract AFTER i let gravity work its magic. Because i still there there may be some oil stuck in lines. Unless, you change your oil after the truck has sat in one spot for a while. But thats not the way youre supposed to do it.

 

You'll never get it all - give up on that. Engines like these commonly hold a 1/2 quart or more in all sorts of places that simply can't drain out.

 

Yes, it is quite possible that a residual amount of oil will not drain out. One should consider the variables vs the method to achieve the perfect oil change.

Oil viscosity and temperature at the moment you are changing the oil by either method - gravity or vacuum extraction - plays a big role on this.

For example and in reference in http://www.oilviscositychart.info/

Viscosity and temperature - Viscosity is inversely proportional to fluidity. The less viscous, fluid will flow easily compared to high viscous fluids. For example water has less Viscosity than honey. Hence water will flow smoothly in comparison to honey. One can think of Viscosity as fluid's resistance to flow. Viscosity is dependent on temperature. A temperature change will cause the viscosity of the fluid to increase or decrease.

Viscosity can be measured as :

1)Dynamic Viscosity - Dynamic viscosity is determined by measuring shear stress. Unit of measuring dynamic viscosity is centipoise (cP).

2)Kinematic Viscosity - It is more popular method. It is calculated based on the time taken by oil heated at specified temperature to flow through a hole of specified size. A capillary test can be use to provide accurate measurement. Unit of measuring kinematic viscosity is centistoke (cSt). Oil which is high in viscosity will take more time to flow out of hole. Oil high in viscosity are known as thick oil and oil low in viscosity is known as thin oil.

Points to remember

Viscosity is inversely proportional to temperature.

Viscosity is directly proportional to pressure.

The viscosity of oil decreases when it is heated.

I am pretty sure many of us change the oil after the engine is warm up in order to drain or extract out the most amount possible, residual oil will always remain in various degrees, including the oil filter.

Frank