That was a truncated log.
I tried quite a few different wood, I believe agafari branches and the other type of firewood (bundles, I think, this was over a year ago)? As you those able to infer context might be able to surmise, that log was the tail effort of probably 2 ooc hours of throwing various combinations at the grill and having nothing work, spending 3-4x the grill's value in possible fuel-sources, before my poor lad snapped.
In short: if there's any wood that works in a grill, I couldn't find it.
But oil, yes. Oil/alcohol does work. I think I ended up fueling the next one with agave.