Hi Mate,
Welcome to Australia, don't worry about sharks and spiders, just remember to wear sunscreen.
I agree with Astro above, a full-synthetic euro oil in either A5/B5 or A3/B4. Both are full-SAPS, but differ in HTHS, with the A3/B4 being a bit thicker with a higher HTHS. Select either a 30 grade or a 40 grade oil.
Oil is very expensive in Australia, but every second week either Repco or Supercheap Auto or AutoBarn will have an oil sale. Keep an eye on these, and buy when on sale.
That Penrite 10-Tenths Racing (100% PAO & Ester) is a very good oil, I've used it before, but it's also very expensive. Also in Australia, M1 is also very good but also very expensive. Both are rarely on sale.
Other good, euro rated and full synthetic oils, but more commonly on sale are:
- Valvoline SynPower 5W40 A3/B4
- Valvoline SynPower FE 5W30 A5/B5
- Castrol Edge 10W30 A5/B5
- Castrol Edge 5W30 A3/B4 (also MB 229.5)
- Castrol Edge 5W40 A3/B4 (MB 229.5 and Porsche A40)
- Castrol Magnatec 5W30 A3/B4
- Shell Helix Ultra 5W40 A3/B4 (MB 229.5 and Porsche A40)
- Shell Helix Ultra X 5W30 A3/B4 (MB 229.5)
- Shell Helix HX8 5W30 A3/B4 (MB 229.5)
- Penrite HPR 5 (5W40) A3/B4 (MB 229.5)
There are others like M1 0W40, Edge 0W40, Synpower 0W40, and Penrite Full Synthetic 10W40, but they are rarely on sale.
The list above will give you options, if you are looking for alternatives. I use a lot of the Shell Helix Ultra 5W40 and the Castrol Edge 5W30 A3/B4 myself. Due to quality, availability and price, plus both also carry MB229.5
However if you like the Penrite 10-Tenths Racing, then go for it, it's good stuff. One of the few racing oils that also carries API and ACEA ratings, so it's good for the street and good for the track.
Note: that Penrite 10-Tenths Racing 5W30 you linked to is their racing oil, so it carries a lot of zinc (ZDDP) at about 1800 ppm. It's an anti-wear additive. A regular Euro oil carries about 1000 ppm, and a Dexos1 oil about 800 ppm. You can also get a Penrite 10-Tenths Premium 0W40 A3/B4, it's also PAO based, but it has a more regular 1000 ppm of zinc. Which is ample.