You use regular ATF in the tranny instead of Dextron III? and can you tell the difference?

Can you more precisely define "regular ATF?" Dexron III is no longer licensed by GM, so the oil companies have been using new and creative names to describe the equivalent product.

It would be good to know what car you have. If you're driving a W123 like me it specifies Dexron II which is what most bottles sold as standard ATF are. Even if you have a newer model that rquires Dexron III I don't think topping off with Dexron II is any great calamity. If you did a fluid change with the wrong stuff I would say drain and replace. It's much cheaper than a premature transmission rebuild.

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'82 300D - Light Ivory, 2nd Owner (Back in the wind April 2013!)

'95 E300D - White, grey interior. (Suffering from stuck/broken glow plugs)

Deuteronomy 22:4-
"Thou shalt not see thy brother's ass or his ox fall down by the way, and hide thyself from them: thou shalt surely help him to lift them up again."

I don't think Dexron II is sold anymore. Dexron III is backward compatible and is what is commonly used on ours.

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)