Good to see someone making the effort to understand what's really happening in their engine.
Going by what I could see, 10,000km should be fine. And there's no need to pay for the overpriced Toyota filters. Ryco probably make them anyway.
No coolant probs? Glycol increased in the last change.
Kinda makes you doubt the 5,000km service interval. Dealers make a nice profit out of it.
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