First of all, ATF is supposed to be a Synthetic Whale Oil...
Use Goggle and stick in Ed's Red and read about it...
But another gun maker (in Penns) also recommends the same thing... I was highly dubious, to say the least. A friend of mine used it on a gun that had curl but it was not really obvious when it was new. He applied ATF and in about two weeks he said it was like having a new gun - the curl just popped out...
So, if TVM is recommending it - and you like curl - I would go for it...
Redhand in Hawaii - BTW - It can't hurt... because I have been using Ed's Red in my other guns for about 10 years.
Ed's Red Cut and Paste---An inexpensive, effective substitute for sperm oil is Dexron (II, IIe orIII) automatic transmission fluid. Prior to about 1950 that most ATF'swere sperm oil based, but during WWII a synthetic was developed for use in precision instruments. With the great demand for automatic transmission autos after WWII, sperm oil was no longer practical to produce ATF in the quantity demanded, so the synthetic material became the basis for the Dexron fluids we know today. The additives in ATFs which include organometallic antioxidants and surfactants, make it
highly suitable for our intended purpose.