I have been using XTOL diluted 1:2 and 1:3 for some time with good results developing both T-MAX 100 120 and HP5+ 5x7. A few days ago I went to the Kodak web site to load publication j-109 (XTOL). There is a new version dated 9/00 that replaces the old of 4/00. The major change is the deletion of dilutions 1:2 and 1:3. Dilution 1:1 is still present. I e-mailed kodak and this is the response (I hope you find this information useful):(posted 8609 days ago)"Luis,
Kodak has tested XTOL Developer for long-term keeping by using typical equipment and procedures. Results indicate that mixed XTOL Developer stored for one year at room temperature (70°F [21°C]) in a full-stoppered bottle provides satisfactory results with Kodak black-and-white films when used at full strength. Some customers, however, have reported problems with developer stored for periods between six months and one year. Most often the problems related to loss of developer activity when customers were using a 1:3 or 1:2 dilution of the developer to process KODAK T-MAX 100 Professional Film.
To help ensure best results, we have changed our recommended shelf life and dilutions for XTOL Developer. The new recommendations are the same as those for KODAK Developer D-76 (full strength and 1:1). The change in recommendations does not indicate any change in the formulation of the developer. If you have been consistently obtaining satisfactory results with diluted developer and you use the mixed developer before keeping characteristics can become a concern, you may want to continue your current procedures. However, Kodak publications will no longer include development recommendations for the 1:2 and 1:3 dilutions of the developer.
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Thom Bell Kodak Information Center (USA) Kodak Professional