As the sticker says cambelt should be done at 100,000 km you can be sure they will last at least that long (unlike some other brands which have to be done at 70k or 80k).
Oil brands tend to generate some debate. I had a look on the internet at "engine oil comparisons" and there are about 12 million posts. However there is a great source of objective infromation at:
http://www.trustmymechanic.com/motor-oil-bible.pdf It is very long (177 pages) but you will know a lot more about oil at the end. The author concludes that synthetics are much superior to petroleum based oils and recommends oils with a track record such as (but not limited to) Amsoil, Redline or Mobil 1. Apperently the early synthetics (1970's) were hard on seals but this is not now the case. However he urges caution with changing late in life (Stageas are nealy all 10 years old now) as there is a possibility that seals damaged by years of petroleum based oils but sealed with gunk could start to leak when the engine is flushed out and synthetics are used. I plan to make the change anyway so I will let you know if my 1977 car starts leaking oil! He asserts that synthetics are good for up to four times the km of petroleum based oils but even if you change half as often that will ease the expense of the better oil.