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Message: <blockquote data-quote="StevieB327" data-source="post: 127995" data-attributes="member: 23514">I have a Case XT 60 and have been informed that the HTO additive is no longer availiable. I am sure others have crossed this path and would like to get some thoughs on this. I am looking at 2 different options. Case No. 1 Engine Oil SemiSynthetic SAE 10W-40 CK-4    Zinc 1 - 2.9%     %w/w        Shell Rotella T4 10W30 Triple Protection API CK-4, CJ-4, CI-4 PLUS, CI-4, CH-4 ·    Zinc 1,203 ppmThe Shell option is what I am leaning towards as I use that in other equipment already.  I believe the HTO additve is something like zinc dialkyl dithiophosphate (ZDDP) for the most part and T4 does have that in already. I did have to add 2 gal of 30w without the HTO additive for now to top it off.  With 11 gallons in there WITH the HTO addivive, I figured I'd be ok until I figure out the best course of action is. Wasn't sure if I could mix oils to add, so I stayed with what was in there. I plan to do a complete oil and filter change once I settle on what to do.My dealer said any mat spec 3572 or higher would work, but I could't find a cross reference of oils for that anywhere... Only the Case No.1 listed that spec.  I would like to know what others are using.</blockquote>