Huh??
That's a strange question. Have you ever checked the oil right after an oil change?
It's then transparent to amber in colour, depending on the type and brand.
Over the 'life cycle' of the oil, during 5000 miles of use, dust, dirt, soot is deposited in the oil. One of the functions of the oil is to keep particles suspended, so that they do NOT deposit somewhere in the engine. As technology progresses, less and less dirt is deposited during an oil change cycle, thus the intervals keep increasing. Even so, the capacity of oil to keep dirt suspended is limited, thus the 5000 mile change interval. That's actually true with
normal 5W30, too as this is a synthetic blend.
If you go to Europe, a liter (not gallon!!!) of oil in 5W30 will set you back 15-20 Dollars PLUS recycling charges for the dirty oil, but they have change intervals of 15-25,000 miles. (20-50,000 km). And their motors don't collapse either. Of course, that expensive stuff is specially formulated for the long intervals, and ours here in North America is not formulated for THAT long intervals, but even so, you don't have to worry about the 5000 mile interval.
I go at least 5000 miles, sometimes 6000 miles before changing and (we have two corollas) no problems whatsoever, one of them is now beyond 100,000 and still going strong like a new one. We don't give special instructions to the (Toyota) garage, they put 5W30 that's all.
Hi from cold Montreal,
Joachim