yeah, i got told by i dont know how many people - just use the holden stuff. there is no gain from using anything else and its competitively priced, GM spend millions on quality control, technology development. good enough for me
use holden genuine, comes in a 5ltr container from your dealer, use that and the rest water, will be all good. i always try and use genuine were ever possible unless univoidable or a massive price difference between gen and non genuine if simmilar product.