Totally agree. RX350 is 15,000kM or 12 months. Hilux is 10,000kM or 6 months. Both get 6months even with 100% synthetic oil. It isn't just oil, it is tyre rotation. If you don't rotate tyres and assess alignment and pressures every 5,000kM you can shag a set of tyres in 25,000kM. I just bought 4x new Yokohama GO55 235/55/19 tyres for the RX350 at $340 a pop. Original Dueller 33's were almost at 20% on edges but like 75% left in centre as it did 15,000kM in its first 10 months, and no rotation or pressure checks. Plus alignment can change quickly in the first 10,000kM. Lexus was out front and rear.
Other issue is manufacturers are specifying oil for economy and not showing us proper SAE graphs in the manuals. The Lexus, Hilux and my CV8 all call for 10W-30. 30 is too thin for Australia, proper SAE curves show 30 only good up to about 32deg or so. I use 10W-40 Nulon synthetic, good value on 20% off days at Repco or Supacheap plus comes in 6L which is good as both cars take about 5.6L. I use 10W-60 Castrol Edge in the CV8, used Mobil1 10W-30 at first but it ran so much quieter with the 60 weight oil.