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  #1  
Old 07-15-2021, 01:21 PM
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How to clean up that ultra black engine diesel oil from concrete

If your engine is not a diesel, you don't really know what I'm talking about. Do any of you have a solution to cleaning this stuff off concrete? I have an epoxy floor in the garage. It wipes clean off of that the epoxy. But, the driveway concrete is not epoxied. What is the best way to clean it?

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  #2  
Old 07-15-2021, 01:24 PM
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I hear some volunteer fire departments do it gratis as hazmat training. I don't have any practical experience with this, except for the leaving a stain part.
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  #3  
Old 07-15-2021, 03:06 PM
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I'd be a bit embarrassed to ask them to clean up a few little spots. This is brand new concrete that I want to still look new.
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  #4  
Old 07-15-2021, 03:11 PM
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Hot water pressure washer, acid etch, then................paint over what's left. Carbon black is one of the darkest substances known to humanity, and that's basically what's suspended in the oil. Like India ink.

As for removing it, the best luck I've had is to get it up absolutely as soon as possible, using carb cleaner and a rag. Once it's set, no clue. My shop looks terrible too.

Pretty sure Moon was joking about only burning down the building removing those oil stains.
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Old 07-15-2021, 06:46 PM
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Oil eating enzyme, do a google search.
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  #6  
Old 07-16-2021, 03:40 AM
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This thread is fitting...yesterday my daily decided to get a hole in its sump and give itself a impromptu oil change overnight all over the concrete
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  #7  
Old 07-16-2021, 07:39 PM
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Originally Posted by NZScott View Post
This thread is fitting...yesterday my daily decided to get a hole in its sump and give itself a impromptu oil change overnight all over the concrete
Okay, I’ll bite.

?????
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Old 07-16-2021, 08:58 PM
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Terminator-HSD seems to work for me. It’s one of the oil eating enzymes mentioned above. It’s slooow to work and can’t keep up with a bleeder but should do fine with old spots.

Michael
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  #9  
Old 07-16-2021, 10:47 PM
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Clean as much oil away as possible. With the spot wet, grind some concrete powder from a bag of sakrete with your heel and sweep away any excess with a broom. Let dry and it will look like new.
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Old 07-16-2021, 11:56 PM
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Muratic (pool) acid might lift it off
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  #11  
Old 07-17-2021, 04:49 PM
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Acid. Phosphoric, Muratic and probably many other will eat it. You can get them all online or at any hardware store. Don't buy diluted acid cause you want to mix the strength of the solution by design.

Beware, they also kill plants so use sparingly. It it's going to run to the street you might want to have plenty of water to dilute it well before it hits the asphault.

Acid which will eat black diesel oil will also eat you so do a thorough search for safely precautions and don't skip anything.

If you select the right product you can store it for later use if someone drips on your drive again.
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Old 07-18-2021, 01:56 PM
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If you've got an old diesel, you may as well coat the garage floor either with epoxy or something else impervious to oil stains. That concrete will absorb the carbon permanently in about 1 min. I've decided to relax my OCD and eventually have an epoxy job done on the garage. For now, I just enjoy the stains.
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  #13  
Old 07-18-2021, 04:24 PM
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Forbid that any of us have an old diesel MB which doesn't leak oil.
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  #14  
Old 07-18-2021, 11:42 PM
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Quote:
Originally Posted by gregp1962 View Post
If your engine is not a diesel, you don't really know what I'm talking about. Do any of you have a solution to cleaning this stuff off concrete? I have an epoxy floor in the garage. It wipes clean off of that the epoxy. But, the driveway concrete is not epoxied. What is the best way to clean it?
Clean the excess with oil dry from the auto parts store. To completely remove the stain, just let time in the sun and the elements do it. That's the permanent way to do it.







.
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  #15  
Old 07-27-2021, 02:32 AM
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Originally Posted by Shern View Post
Okay, I’ll bite.

?????
Hit something the night before, thought nothing of it until greeted with a large oil stain the next morning...


Ironically the day after I unbolted the sump off, we got a flood and had to be evacuated...I jacked the car up to keep the water out of the crankcase though (got about 8" deep where it was parked)
Now the water is gone there's still a stain though


The other night I stole the sump off another off the 240D until I get a brand new one...(the holy one not worth fixing)

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD

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