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  #1  
Old 05-29-2002, 12:17 PM
surfblau's Avatar
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Location: san francisco - immer kalt, immer windig, I want to move
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cleaning / purifying used synthetic oil - is it possible (at home)

If there have been any posts on this- sorry.

I was looking at my waste oil collection last night, some of which was in a 1.5 liter clear plastic water bottle. Surprisingly, there was clear reddish product on about the bottom half of the bottle with sooty black waste oil on the top (half or third?). The bottle had been sitting upright in the garage for around 8 weeks and I believe contained Delvac 1300 with about 3000 miles on it.

It occurred to me to topside off the product and reuse during the next oil change. Actually, since I changed to Delvac 1, I would only do the proceedure on that waste oil, not the dino. At a minimum, I could recover half the cost of the synthetic, which makes it less painful for my wife when she sees the credit card bill.

I saw different types of centrifugal separators out on the net that spin waste oil to remove the soot, so it appears that some businesses are doing something similar.

If anyone has thoughts on this, let me know. Some questions include-
-- Would this even work with synthetic (I guess I will find out in a month or two)?
-- Is there any way to accellerate it (I was thinking of something along the lines of freezing- but I will have to research, could also build a garage centrifuge...)?
--Is the product compromised because some of the additives are bound in the soot layer?


thanks

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Old 05-29-2002, 02:46 PM
LarryBible
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This would be quite a process and keep in mind that the byproducts of combustion which are the contaminants in your oil are carcenogynic(sp?)

Good luck,
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Old 05-29-2002, 02:53 PM
surfblau's Avatar
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Join Date: Feb 2002
Location: san francisco - immer kalt, immer windig, I want to move
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no problem with the toxicity...

The combustion by-products may be bad, but the oil itself is carcinogenic. The early cancer studies (in the 20s?) were done with oil (or coal tar) on test animal skin. So I am not too worried about that- anyone weekend mechanic with a diesel ends up getting some dermal exposure.
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Old 05-29-2002, 03:06 PM
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Location: Soperton, Ga. USA
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We go through thousands of gallons of Mobil Synthetic paper machine oil at work (one of the lube oil bowsers is 6000 gallons) and we have an extensive filtering and de-hydrator system that is run constantly. We do not try to clean/re-use oil that has spilled into the containment dike.
I would not think it would be economically feasible to try to clean/filter and re-use oil at home.
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Old 05-29-2002, 07:05 PM
Don Stevens
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If you want to save money......

Whatever you would save in such an endeavor could not possibly be worth the effort. Further, there will still be some level of unknown contaminants in the waste oil that you cannot "skim off"

I can get you Amsoil Synthetic Diesel 15W40 oil for $3.90 per quart and I have proven through oil analysis that you can safely drive 15000 miles on one batch. Isn't that less than the per qt per mile price you are paying for your Delvac and a 5000 drain interval?

If that is too pricey I can get you Schaffer's 15W40 synthetic blend diesel oil for $2.95 per qt. which can likely go almost as far between drains.

Don
www.lubedealer.com/dstevens

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