Shell ATF134 is readily found in most discount auto part stores & meets MB236.12. Price for a 6-pack of the fluid is reasonable on Amazon.

Just saw Ronman's Post #3. So comment above just repeats his post.

I think I read somewhere that the Shell product was what M-B used during assembly of the cars originally. And remember if you ever consider purchasing the M-B products for engine oil, transmission fluid, etc., M-B doesn't own a plant where these products are produced. They have a contract with a firm or firms that do produce these products and those products fill bottles with M-B labeling on them. And I forgot to mention it is quite possible that the contract M-B has with it's supplier of various fluids probably goes up for bid every year or 2 or ? to keep costs down & profit margins where required.