Solvent To Clean Oil Bath

That's the first sign.

I don't recall the second one.

 

I was told a way to clean an oil bath was to fill it with ATF for a cycle or two instead of the usual engine oil

 

I came across an old can of Pure Mineral Spirits and compare to a new "Made with" Mineral spirits.

 

Sounds plausible. ATF has more detergent than motor oil, though oil made for diesel engines also has a lot of detergent. Likely it would be much more effective compared to an old-fashioned non-detergent motor oil, but maybe not so different from a modern detergent oil.

 

Arizona is another emissions-concious place. If it's adulterated with water, I wonder how they keep the parts mixed - detergents?

Check the MDSS - this is their main product, all hydrocarbon, no water.



There are a couple other versions that are low VOC. Here is the one that's CARB legal -



This info should be on the can. The "Made with Mineral Spirits" seems applicable to both, so it may not be obvious to the naive consumer. Possible they use the same can design for both products. The image on their web site does not change when you select the different products, and they don't show the backs of the cans.

Note "hydrotreated" does not necessarily mean water; instead it's a product that's hydrogenated in the presence of a catalyst. Apparently that reduces the VOCs somehow. The exact process seems to be a trade secret. A chemical bond of the HCs to the hydrogen in water?

 

Possibly we are looking at DMC. From Wikipedia, edits and emphasis mine...

Dimethyl carbonate is traditionally prepared by the reaction of phosgene and methanol. Methyl chloroformate is produced as an intermediate: This synthesis route has been largely replaced by oxidative carbonylation. In this process, carbon monoxide and an oxidizer provide the equivalent of CO2.

It can also be produced industrially by a transesterification of ethylene carbonate or propylene carbonate and methanol, which also affords respectively ethylene glycol or propylene glycol.

Solvent
In the US, dimethyl carbonate was exempted under the definition of volatile organic compounds (VOCs) by the U.S. EPA in 2009.[8] Due to its classification as VOC exempt, dimethyl carbonate has grown in popularity and applications as a replacement for methyl ethyl ketone (MEK) and parachlorobenzotrifluoride, Dimethyl carbonate has an ester- or alcohol-like odor, which is more favorable to users than most hydrocarbon solvents it replaces.

Dimethyl carbonate is partially soluble in water up to 13%, Dimethyl carbonate can freeze at same temperatures as water,