engine oil appearance question

[jack black]

I just got 2007 red Yaris hatchback base AT under 66,000 miles with clean title and overall good condition (as far as I can determine). I asked the owner when was the engine oil changed last time. He didn't know, but he thought his wife had it done recently. He could produce no receipt. The last receipt he had was 6,000 miles ago at a dealership. I knew about that one as it showed up on a CarFax report.

Here is the thing. The oil is just under the max line and looks very fresh, but very yellow like some batches of penzoil or maxlife. So, I'm thinking it's fresh oil indeed. On the other hand, my other car (Prius) has fresh looking oil past 5,000-6,000 miles too. Corolla, on the other hand, would make oil much darker past 3,000 miles. What would be expected in Yaris?

Thanks!