I spoke with Aydin at Alkin US recently and was told that they no longer use or sell Anderol 750 or Anderol 755 for Alkin compressors. They are now recommending something they call ”Alkin 100” compressor oil. The reason stated for the switch was that their tests concluded that the breathing air quality was better using Alkin 100 oil which he stated was a full synthetic oil. To order you have to call until they do something with their mobile site (not sure how it looks on a desktop). The pricing quoted to me is is $160 per gallo, $44 per quart. This does not include shipping.
I’ve read the documentation for Anderol 750 which was listed as a diester synthetic oil from what I recall. Here is the product data sheet that I read about Anderol 750
https://anderol.com/pds_api/handler.php?task=dl&hash=bf0701af5a59e9a7100d3d0f34cc5d2b7dd907e0 I have not seen a data sheet for Anderol 100 oil. After running a search engine search Pyramyd AIR and Utah Airguns are selling Alkin 100 with a description that still reads Anderol 750/755. On Alkin US mobile site it takes you to this page when trying to click on the oil to purchase online.
https://www.alkinus.com/parts If you click the above link a “Get A Quote” box pops up.
A search engine search lead me to this Alkin page where it can be ordered.
https://www.alkinus.com/product-page/anderol-750-compressor-oil I have a feeling there’s more to this. Judge for yourself what you should use based upon what is called for and the composition and viscosity of your chosen compressor oil.