guys i think youve mistaken penrite mineral oils.... theyre pretty average i know... but check out thier SIN (synthetic) oils, rated very highly in recent testing.
Have a read of street commodores mag no. 108, they have tested the 18 top oils on the market through various tests. Out of them Royal Purple and Penrite SIN oils performed the best... funny to see the Mobil 1, Motul, Redline, and Castrol Performance synthetic oils performing so bad...
So just before you guys bag the penrite have a read its very interesting