ATF is a glorified hydraulic oil. It has no purpose being in an engine under any circumstances. Typical KV100 values for Dex VI is ~6 cSt which is equivalent to about a 0w-12 engine oil.
MMO is 70% pale oil with small amounts of alcohol, naphtha, and chlorine. I'd pass.
Detergents don't actually "deterge" as the name is a bit of a misnomer here. Detergents (in this sense) are acid neutralizers most commonly in the form of calcium carbonate and magnesium carbonate. These are also found in the medicine aisle under the names Tums and Milk of Magnesia. The same way they neutralize acids in your stomach that cause heartburn and indigestion, they neutralize acids in the oil that cause oxidation and corrosion. Detergents exist to keep the oil clean, not clean the engine.
The only thing that belongs in an engine is a fully formulated engine oil. I don't like supplements. If the oil you're using isn't cutting it and you're having issues, use a better oil.
MMO is 70% pale oil with small amounts of alcohol, naphtha, and chlorine. I'd pass.
Detergents don't actually "deterge" as the name is a bit of a misnomer here. Detergents (in this sense) are acid neutralizers most commonly in the form of calcium carbonate and magnesium carbonate. These are also found in the medicine aisle under the names Tums and Milk of Magnesia. The same way they neutralize acids in your stomach that cause heartburn and indigestion, they neutralize acids in the oil that cause oxidation and corrosion. Detergents exist to keep the oil clean, not clean the engine.
The only thing that belongs in an engine is a fully formulated engine oil. I don't like supplements. If the oil you're using isn't cutting it and you're having issues, use a better oil.