yeah oil is fun especially here in aus.
semi and fully synthetic in aus can have as litte as 10% synthetic stock in it (approx), only bottles which say 100% synthetic are exctly that.
MOTUL and REDLINE are among the best oils you can buy, ester is the key here
Learnt alot from a Wear Check training sesion last tuesday on oil testing and talking to alot of the industry experts it was interesting to find what oils are actuially good oils and what are all about marketing bullshit. www.wearcheck.com
favourable: MOBIL 1 (gold bottle is 100% synthetic) motul, and redline.
unfavourable; castrol edge and thier mineral gear oils.