Upshifting at 2500 - 3000 rpm is good, but at 4000 - 4500 is not bad too. We are still in the tolerable range of the engine, I'm convinced about that. My previous Yaris doing already 160.000 km still runs perfectly at very high revs with nearly zero oil consumption, no smokes, never failed or been major repaired.
May be you're right when talking about small engines < 1.0L.
Now, back to the facts of this car:
First time I changed the oil engine in a dealer shop, they put semi-synthetic 10W40. I was not satisfied about it, and then decided to change it again, for a full synthetic 5W40, but this time I've putted before an additive for cleaning the engine before the change. The result is kind of oil very black and thick... this car seems to be very bad treated before!
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