this is a whole 'nother can of worms. problem is that the same brands that use cracked base stock as synthetics, use the same stuff in their blends. so you are getting a blend of dino base and a mix of more refined dino base stock (like a group III).timewarped1972 said:what about the blended stuff? i've used that as its half and half, but cheaper than full synthetic.
ive only read specs on one brand of blend, and the batch tested showed anywhere from 12-22% group III mixed in with the normal dino oil (the group III is considered the synthetic, though it is not PAO base stock). so really it is 75% or more dino oil and 25% or less normal dino oil.
but if it costs a little more a quart, go for it. probably mostly a peace of mind thing anyhow. ive used it before......(whatever that is worth. oh wait i know. that and 10 bucks will get you a coffee).