Originally Posted by rpauls
Why is there no synthetic 30W?
I'm not sure, but I think it would a contradiction of terms. 30W I believe is by definition a straight oil with a viscosity of 30. My guess is they have not figured out how to make a synthetic that behaves EXACTLY like straight oil. I mean, if they did, from that maybe we could then make man-made gasoline, and to hell with the middle east.