Servo horn; I use the Answer RC 25T on an Xpert servo, pro tip - remove the washer on the ballstud on the steering bellcrank to lower it down, then use the shorter ballstud hole on the servo horn. That way you get more steering resolution which will make the steering feel much more accurate. Also less strain on the servo as there's less mechanical advantage over if you smack into something.
Oils; Personally I swear by the Associated shock oil, it's the most consistent and least temperature sensitive oil I've used over the years so I've stuck with it.
As for diff oil I use the Core RC oils as they do the full range we need (going right up the the 300k goop we use in the centre diff) and are easy/cheap to get hold of.
Remember Re the shock tops there are more traditional style alloy caps coming from HPI/HB soon. They're being manufactured now AFAIK and should be here sooner rather than later (don't hold me to that though!).
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