Richard Gomez
I used Delvac MX 15w40 on my LC100 for the first 24k km then shifted to delvac 1 5w40 full synth. On delvac MX, use to replace every 5k km or 6 mons but on delvac 1, will do max 1yr or 5-7k km interval.

Since an oil change requires 11.5L in the LC100, there's a huge price diff between mineral and full synth. I think mineral is ok if you only do low speed driving but, if you travel a lot (high speed) then a full synth is better protection for the turbo.

The toyota oil filter for the 1HD-T engine is a twin element type, meaning it has a full flow and by-pass filter combined. This type can easily handle 10k km use but they recommend only 5k km under extreme use. The point is- a bypass filter can actually extend the life of an oil by removing finer impurities thus less wear on the engine's internals.