Gernerac 3250 small generator

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Time for my first oil change, what shall I use? Manual says 30w or 10w30. Rotella T5? Mobil 1 HM 10w-30? I thought I read one time that these engines have unusually hard internal surfaces..
 
Either of your choices are fine, the T5 is more economical, but if you have enough OPE, buying a jug of M1 HM 10w30 goes a long way.

Either way is miles ahead of the mineral SAE 30 you will find with antiquated API ratings.

There are plenty of good SAE 30s, like Pennzoil or Valvoline.
 
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