Originally Posted By: Jetronic
Originally Posted By: Sealbilly
Originally Posted By: Quattro Pete
Some call it unoficially group III+, but technically it's group III.
I went back k and did some research and you are correct it's called a group III oil. It's is considered synthetic so III+ or 3.5. It's supposed to be a great cleaner so I'm guessing that's whey everybody says to use platinum in dirty motors. I'm glad to see Rotella is going to be hitting the shelves soon with this formula supposed to also be really shear stable so my motorcycles and jeep will be getting a new drink.
compared to PAO synthetics, the GTL oils still ave a very narrow band of viscosities for base oils so they can only be used for relatively thin oils. The VI isn't quite as good as PAO either but it's closing the gap. The temperature stability isn't the same either, and the pour point isn't as good either.
Better in most respects than a non-GTL group III base oil, but not up to the level of PAO. Price is definitely better for GTL though.
High quality group III ie Visom or Pennzoil's GTL also have some benefits over PAO. Seal compatibility,additive solubility, come to mind.