Nah you and Fuji are both wrong - it came out looking like normal used oil, but pretty black. Viscosity measured 68 on their scale, normal for the oil I used was 62-65, so it was a little high but hardly tar.

If your oil was thin, you had a lot of unburned gas in it - this is bad, could be due to rings, need of a tuneup, or excessive idling.

Normally, crude oil will thicken with useage as the smaller molecules boil off when it is hot. Synthetic oil is not nearly as susceptible to boiling off since the molecules are engineered to be the same size. This is why synthetics perform much better in volatility tests (which measure thickening under extreme heat) than crude oils.