Buying secondhand Prius C

Hi all,
new here - just looking forward to move to hybrids now.
I'm in New Zealand so most of the used cars on the yards would be Japanese imports. Was looking at Aquas circa 2015, however my better part figured it'd be too small for us - ok, we switched our attention to Fielder Hybrid which is essentially JDM Corolla Wagon with the power train from Prius C, hence posting in this forum.

Thing is that after looking at three fresh imports within few days, on two of them I found quite significant emulsion on the dipstick both before and after test drive. Yard guys told me the oil hasn't been changed so it was as it came from Japan. The oil colour was actually fresh, not abused at all I'd say within a 1000 km from replacing. The cars themselves were 2015 with odometers around 60kkm, quite clean and did not look abused.

Question what'd that be? Blown head gasket? Car yard people washing the engine bay too hard? Condensation due the high humidity and short test-drives (we're mid-winter here, humidity is like 98 percent)?

I guess the simple answer would be "run away and look for another car" and that's what I did but it also made me curious.

Cheers

 

Thanks for your replies folks, made me less anxious about that
Will continue hunting around and guess joining the crowd fairy soon.