i just put royal purple 10w40 in on the weekend, can't say i've noticed much difference (but i also upped the boost a little bit at the same time...)
but i rest easier knowing its got good blood in it.
**Also, anyone who is on the gold coast - tell autobarn to start keeping this on hand, cos I had to pay 8 freight when i had them order it in for me (sleazey c*nts) and then they say "hmm haha, we should keep this on stock, you're like the 10th person to order it haha" that's when i jumped the counter and smashed his head into the til, grabbed the cash, my oil (of course) and a little smelly pine tree for the road and then peeled the hell outa there! Or that's how i remember it anyway....
actually maybe we should ask them to stock redline while we're at it?