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atf is like all detergent lol
i use it to clean varnish out of engines and quiet noisy lifters.
I thought we were discussing penetrating fluids and not engine flushes?
I take it you have a chemical analysis to back up this myth?
If I were making a homeade penetrating fluid, I would use the thinnest fluid I could find with some lubricating qualities.
Someone mentioned Berryman's B-12 and it does contain about every solvent available for fuel systems cleaning. But use gloves, it contains some nasty stuff.
One of the components you want in a penetrating fluid is something called a "surfactant." I'll let you Google that. The solvents and acetone help with that.
The other component needed is a lubricant to hold the surfactants and to provide fricton reducton. The thin base oil of ATF helps with that.
Another component you want is an Anti-Wear agent and ATF contains about 300 ppm of anti-wear agent TCP (or similar) to help twist bolts wthout galling. It also attacks the rust.
So for a quick, home made penetrating fluid, I would suggest 25% B-12 Chemtool® Carburetor, Fuel System and Injector Cleaner and 75% DexronVI, OR 25% B-12 Chemtool® Carburetor, Fuel System and Injector Cleaner and 75% Valvoline's Maxlife 6 cSt ATF.
Be careful with anything containing acetone or ANY ketone, since it may attack elastomers and paint.