engo, try Redline Lightweight Shockproof
dori32, stop smocking crack, get a 0w or 5w oil. Piss off the penrite, elf i don't know about. I believe they do have some grp4 and higher oils.
Let's all make this simple. Go here...
www.performancelub.com
if you don't want to splash for Redline, get Royal Purple, German Castrol (Castrol Syntec) 0w30 (other weights "may" be made from grpIII and made in the U.S.) or Mobil 1.
If not those, get some Motul 300V i think is grp4 and the one cubes uses 8100 or whatever, i believe is about one of the cheapest grp4's. Check the thread, it's all there. Motul can be found locally off the shelf.